Battery pack and energy storage system

Abstract

The utility model relates to the technical field of energy storage, and discloses a battery pack and an energy storage system. The energy storage system comprises a battery pack, the battery pack comprises a box body and a battery module, a first panel of the box body is provided with a first connector lug and a second connector lug, and the first connector lug and the second connector lug are located on the two sides of the first panel in the first direction respectively; the battery module is arranged in the box body and comprises a plurality of battery cells arranged in series, the battery cell located at the head end of a series loop is connected with a first output row, the battery cell located at the tail end of the series loop is connected with a second output row, and the first output row and the second output row are located on the two sides of the battery module in the first direction respectively; the first output bar is electrically connected with the first connector lug, and the second output bar is electrically connected with the second connector lug. The first connector lug and the second connector lug are separately arranged on two sides, so that when a plurality of battery packs are connected in parallel, clear and regular wiring can be ensured, parallel installation is facilitated, misconnection between positive and negative electrodes is not easy to occur, and the risk of short circuit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to a battery pack and an energy storage system. Background Art

[0002] Low-voltage energy storage systems are widely used and can be used in many scenarios such as homes, industrial equipment, unstable power, and power storage and power generation in areas without electricity to optimize energy saving. Energy storage systems usually include multiple battery packs, which are arranged in a vertical stacking manner.

[0003] In order to realize the parallel function of multiple battery packs, the positive terminals of adjacent battery packs are connected by wires, and the negative terminals of adjacent battery packs are connected by wires, so as to realize the parallel connection of multiple battery packs. However, in the existing battery packs, the positive and negative terminals are led out from the same side, and the positive and negative terminals are arranged adjacent to each other, which leads to dense and messy wiring when parallel wiring, inconvenient maintenance in the later stage, and the positive and negative electrodes are easily short-circuited by mistake.

[0004] Therefore, there is an urgent need to provide a battery pack and an energy storage system to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide a battery pack that can solve the problem of dense and messy wiring when the battery packs are connected in parallel and reduce the risk of short circuit.

[0006] Another object of the present invention is to provide an energy storage system, which, by providing the above-mentioned battery pack, can solve the problem of dense and messy wiring when the battery packs are connected in parallel, facilitate subsequent maintenance, and reduce the risk of short circuit.

[0007] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] A battery pack, comprising:

[0009] A box body, wherein a first panel of the box body is provided with a first terminal and a second terminal, the length direction of the first panel is a first direction, and the first terminal and the second terminal are respectively located on both sides of the first panel along the first direction;

[0010] A battery module is arranged in the box, and the battery module includes a plurality of battery cells arranged in series. The battery cells located at the head end of the series loop are connected to the first output row, and the battery cells located at the end of the series loop are connected to the second output row. The first output row and the second output row are respectively located on both sides of the battery module along the first direction. The first output row is electrically connected to the first terminal, and the second output row is electrically connected to the second terminal.

[0011] As an optional solution, a plurality of the battery cells are laid flat and stacked.

[0012] As an optional solution, the thickness direction of the battery cell is defined as a third direction, and a temperature averaging plate is provided between two adjacent battery cells in the third direction, and the temperature averaging plate is in contact with a large surface of the battery cell.

[0013] As an optional solution, the temperature homogenizing plate is hollow, and the interior of the temperature homogenizing plate is filled with phase change material.

[0014] As an optional solution, a first communication port and a second communication port are provided on the first panel, and the first communication port and the second communication port are spaced apart from each other along a height direction of the first panel.

[0015] As an optional solution, the battery module also includes a fixing belt and two end plates. In the thickness direction of the battery cell, the two end plates are opposite to each other and spaced apart. The plurality of battery cells are located between the two end plates, and the fixing belt is sleeved on the two end plates.

[0016] As an optional solution, the battery pack includes at least two groups of battery modules, and the at least two groups of battery modules are arranged side by side and in series along the first direction. Among the battery modules located at both ends, one is provided with the first output row, and the other is provided with the second output row.

[0017] As an optional solution, the box body further includes a shell, one end of which is open;

[0018] The battery pack further includes a BMS module, which is disposed in the shell and close to the opening of the shell. The BMS module is provided with the first panel, which is sealed at the opening end of the shell to form the closed box.

[0019] An energy storage system comprises a plurality of the above-mentioned battery packs, wherein the plurality of battery packs are stacked and arranged in parallel along the height direction of the first panel, the first terminal heads of the plurality of battery packs are located on the same side and connected by a first power line, and the second terminal heads of the plurality of battery packs are located on the same side and connected by a second power line.

[0020] As an optional solution, a first communication port and a second communication port are provided on the first panel, and the first communication port and the second communication port are spaced apart along a height direction of the first panel;

[0021] The first communication port of one of the battery packs and the second communication port of an adjacent battery pack are arranged adjacent to each other and are communicatively connected via a communication line.

[0022] The beneficial effects of the utility model are:

[0023] The utility model provides a battery pack, by leading out the first output row and the second output row from both sides of the battery module along the first direction, on this basis, it is convenient to lead out the first terminal and the second terminal on both sides of the first panel along the first direction, so that the first output row corresponds to the position of the first terminal, and the second output row corresponds to the position of the second terminal. Since the first terminal and the second terminal are separately arranged on both sides, when multiple battery packs are connected in parallel, the wiring can be clear and regular, which is convenient for parallel installation and later maintenance, and it is not easy to connect the positive and negative poles incorrectly, reducing the risk of short circuit.

[0024] The energy storage system provided by the utility model can solve the problem of dense and messy wiring when the battery packs are connected in parallel by providing the above-mentioned battery packs, facilitates later maintenance, and reduces the risk of short circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to explain the embodiments of the utility model or the technical solutions in the prior art more clearly and easily, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the energy storage system provided by an embodiment of the utility model;

[0027] Figure 2 It is a schematic diagram of the structure of a battery pack provided by an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the battery pack provided by the embodiment of the utility model without the outer shell;

[0029] Figure 4 It is a schematic diagram of the structure of multiple battery cells after being assembled according to an embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the structure of a single battery module provided by an embodiment of the utility model;

[0031] Figure 6 It is a schematic diagram of the structure of the cooperation of two battery modules provided in an embodiment of the utility model.

[0032] In the figure:

[0033] 100, battery pack; 200, first power line; 300, second power line; 400, communication line;

[0034] 10. Box body; 11. First panel; 111. First connection head; 112. Second connection head; 113. First communication port; 114. Second communication port; 115. Handle; 12. Housing;

[0035] 20. Battery module; 21. Cell; 211. First electrode; 212. Second electrode; 213. First cell; 214. End cell; 22. First output row; 23. Second output row; 24. Middle series row; 25. End plate; 26. Fixing belt; 27. Temperature plate;

[0036] 30. BMS module. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] This embodiment provides a battery pack 100 and an energy storage system, such as Figure 1 As shown, the energy storage system includes a plurality of the above-mentioned battery packs 100, and the plurality of battery packs 100 are stacked and arranged in parallel. Figure 1 As shown, the number of battery packs 100 is three. In other embodiments, the number of battery packs 100 may be other than the number of battery packs 100 according to actual needs, which is not specifically limited here.

[0042] like Figure 2 and Figure 3 As shown, the battery pack 100 includes a box body 10 and a battery module 20 disposed in the box body 10, wherein the box body 10 includes a shell 12 and a first panel 11, one end of the shell 12 is open, and the first panel 11 is located at the front side of the shell 12 and is used to block the opening of the shell 12 to form a closed cavity. For ease of understanding, the length direction of the box body 10 is defined as the front-to-back direction, which is the second direction mentioned later, the width direction of the box body 10 is defined as the left-to-right direction, which is the first direction mentioned later, and the height direction of the box body 10 is defined as the up-down direction, which is the height direction and the third direction of the first panel 11 mentioned later.

[0043] Among them, a first terminal 111 and a second terminal 112 are provided on the first panel 11 of the box body 10, and the first terminal 111 and the second terminal 112 are respectively located on both sides of the first panel 11 along the first direction (left and right direction), and one of the first terminal 111 and the second terminal 112 is a positive terminal, and the other is a negative terminal. The battery module 20 includes a plurality of battery cells 21 arranged in series, and the battery cells 21 are specifically square shell battery cells. The battery cells 21 are connected in series in sequence to form a series circuit. The battery cell 21 located at the head end of the series circuit is connected to the first output row 22, and the battery cell 21 located at the end of the series circuit is connected to the second output row 23. The first output row 22 and the second output row 23 are respectively located on both sides of the battery module 20 along the first direction (left-right direction). One of the first output row 22 and the second output row 23 is a positive output row, and the other is a negative output row. The first output row 22 corresponds to the polarity of the first terminal 111, and the second output row 23 corresponds to the polarity of the second terminal 112. The first output row 22 is electrically connected to the first terminal 111, and the second output row 23 is electrically connected to the second terminal 112, thereby realizing the output of voltage.

[0044] By leading the first output row 22 and the second output row 23 from the left and right sides of the battery module 20, respectively, on this basis, it is convenient to lead the first terminal 111 and the second terminal 112 from the left and right sides of the first panel 11, respectively, so that the first output row 22 corresponds to the position of the first terminal 111, and the second output row 23 corresponds to the position of the second terminal 112. Since the first terminal 111 and the second terminal 112 are separately arranged on the left and right sides, when multiple battery packs 100 are stacked and connected in parallel along the height direction of the first panel 11, the reference Figure 1 The first terminals 111 of the multiple battery packs 100 are located on the same side (left side) and are connected through the first power line 200, and the second terminals 112 of the multiple battery packs 100 are located on the same side (right side) and are connected through the second power line 300, thereby ensuring that the routing of the power lines is clear and regular, facilitating parallel installation and subsequent maintenance, and it is not easy to misconnect the positive and negative poles, reducing the risk of short circuit.

[0045] In an optional embodiment, if Figure 3As shown, the battery pack 100 also includes a BMS module 30, which is disposed in the housing 12 and close to the opening of the housing 12. The front side of the BMS module 30 is provided with the above-mentioned first panel 11, and the first panel 11 is blocked at the open end of the housing 12 to form a closed box 10. In other words, the first panel 11 constituting the box 10 is specifically the first panel 11 of the BMS module 30. The box 10 and the BMS module 30 share a first panel 11, which simplifies the structure of the battery pack 100 and saves manufacturing costs. On this basis, the first output row 22 can be electrically connected to the first terminal 111 through the built-in connection row or wiring harness of the BMS module 30, and the second output row 23 can be electrically connected to the second terminal 112 through the built-in connection row or wiring harness of the BMS module 30.

[0046] In an optional embodiment, if Figure 3 As shown, a plurality of battery cells 21 are arranged flat and stacked. By arranging a plurality of battery cells 21 flat, it is convenient to lead the first output row 22 and the second output row 23 out from the left and right sides of the battery module 20 respectively.

[0047] In an optional embodiment, if Figure 3 As shown, the battery pack 100 includes two groups of battery modules 20, which are arranged side by side along a first direction (left-right direction) and connected in series to form a 48V system. Among the two battery modules 20, a first output row 22 is provided on the left side of the left battery module 20, and a second output row 23 is provided on the right side of the right battery module 20.

[0048] In an optional embodiment, if Figure 4 and Figure 5 As shown, a battery module 20 includes eight battery cells 21, which are stacked in two layers in the vertical direction, and four battery cells 21 are placed flat in each layer. Each battery cell 21 includes a first electrode 211 and a second electrode 212, and the first electrode 211 and the second electrode 212 are located on the same side of the battery cell 21, and one of the first electrode 211 and the second electrode 212 is a positive electrode, and the other is a negative electrode.

[0049] Among them, in the first direction (left-right direction), the two battery cells 21 arranged side by side are facing opposite directions, that is, in the left-right direction, one end of the electrodes of the two battery cells 21 are facing opposite directions, and the first electrodes 211 and the second electrodes 212 of the two battery cells 21 are arranged alternately, that is, the first electrode 211 of the left battery cell 21 and the second electrode 212 of the right battery cell 21 are located on the same side, and the second electrode 212 of the left battery cell 21 and the first electrode 211 of the right battery cell 21 are located on the same side, the first electrode 211 of one of the left battery cells 21 is connected to the first output row 22, and the second electrode 212 of one of the right battery cells 21 is connected to the second output row 23.

[0050] In two battery cells 21 adjacent to each other in the second direction (front-rear direction), the second electrode 212 of the front battery cell 21 and the first electrode 211 of the rear battery cell 21 are disposed adjacent to each other.

[0051] In the third direction (up and down direction), the large surfaces of two adjacent battery cells 21 are in contact with each other, and the first electrodes 211 and the second electrodes 212 of the two battery cells 21 are alternately arranged, that is, the first electrode 211 of the upper battery cell 21 and the second electrode 212 of the lower battery cell 21 are located on the same side, and the second electrode 212 of the upper battery cell 21 and the first battery cell 21 of the lower battery cell 21 are located on the same side.

[0052] refer to Figure 3 The above arrangement can make it possible for the two battery cells 21 located on the front side of the upper layer among the multiple battery cells 21 to be respectively the head battery cell 213 and the tail battery cell 214, the first electrode 211 of the head battery cell 213 is connected to the first output row 22, the second electrode 212 of the tail battery cell 214 is connected to the second output row 23, and the first electrodes 211 and the second electrodes 212 of two adjacent battery cells 21 are connected in series through the intermediate series row 24, and each intermediate series row 24 is connected to the corresponding electrode by welding, riveting, etc.

[0053] When the battery module 20 is configured as two groups, as shown in FIG. Figure 6 As shown, the second output row 23 of the first battery module 20 is connected to the first output row 22 of the second battery module 20, so as to realize the series connection of the terminal battery cell 214 of the first battery module 20 and the head battery cell 213 of the second battery module 20, and then realize the series connection of the two battery modules 20. The first output row 22 of the first battery module 20 and the second output row 23 of the second battery module 20 are located at the left and right ends respectively, and the first output row 22 of the first battery module 20 is communicatively connected to the first terminal 111, and the second output row 23 of the second battery module 20 is communicatively connected to the second terminal 112.

[0054] To sum up, by setting the multiple battery cells 21 in the battery module 20 to the above-mentioned arrangement, it is convenient to lead out the first output row 22 and the second output row 23 from the left and right ends of the battery module 20 respectively, so as to facilitate the first terminal 111 and the second terminal 112 to be led out on the left and right sides of the first panel 11 respectively. When multiple battery packs 100 are connected in parallel, the routing of the power lines can be ensured to be clear and regular, which is convenient for parallel installation and subsequent maintenance, and it is not easy to connect the positive and negative poles incorrectly, reducing the risk of short circuit.

[0055] In other embodiments, different voltage requirements may also be met by changing the number of battery cells 21 connected in series in each battery module 20 or by changing the number of battery modules 20 .

[0056] In an optional embodiment, if Figure 2 and Figure 3 As shown, the first panel 11 is further provided with a first communication port 113 and a second communication port 114, and the first communication port 113 and the second communication port 114 are arranged at intervals along the height direction (up and down direction) of the first panel 11. Figure 1 , taking the first communication port 113 as the input port and the second communication port 114 as the output port as an example, the first communication port 113 of one battery pack 100 and the second communication port 114 of the adjacent battery pack 100 are adjacently arranged and communicatively connected via the communication line 400 and the communication connection is realized via the communication line 400, the first communication port 113 of the uppermost battery pack 100 and the second communication port 114 of the lowermost battery pack 100 are respectively communicatively connected to the external device via the communication line 400 to realize the function of communicating with the external device. Therefore, by arranging the first communication port 113 and the second communication port 114 on the upper and lower sides, cascade communication can be performed on the upper and lower ends respectively, which is not easy to mix and match, the wiring is clear and simple, and the installation is convenient. In an optional embodiment, Figure 4 As shown, a temperature averaging plate 27 is provided between two adjacent battery cells 21 in the third direction, and the temperature averaging plate 27 is in contact with the large surface of the battery cell 21, so that the contact area between the temperature averaging plate 27 and the battery cell 21 is as large as possible, thereby increasing the effective heat dissipation area and thermal conductivity, and enhancing the temperature consistency between the battery cells 21. Optionally, the temperature averaging plate 27 is a copper plate with good thermal conductivity. In practical applications, a whole temperature averaging plate 27 can be placed directly between the upper and lower layers of battery cells 21.

[0057] In an optional embodiment, the temperature averaging plate 27 is hollow and filled with a phase change material, such as a copper VC plate. With this configuration, the temperature averaging plate 27 not only has a temperature averaging function, but also can absorb the expansion force of the battery cell 21, thereby ensuring the performance and service life of the battery cell 21.

[0058] In an optional embodiment, if Figure 5 As shown, the battery module 20 further includes two fixing belts 26 and two end plates 25. In the thickness direction (up and down direction) of the battery cell 21, the two end plates 25 are opposite and spaced apart. A plurality of battery cells 21 are located between the two end plates 25. The two fixing belts 26 are respectively mounted on the two end plates 25 to bundle and fix the battery cells 21 and the end plates 25 to form an integrated battery module 20, thereby ensuring the overall firmness of the battery module 20. The fixing belt 26 is preferably a steel belt, which has a high structural strength.

[0059] In an optional embodiment, in order to limit the movement of the fixing belt 26, a limiting groove is provided on the end plate 25, and the fixing belt 26 is accommodated in the limiting groove to limit the fixing belt 26, thereby ensuring that the fixing belt 26 is not easily displaced during the bundling process, thereby improving the stability of the bundling.

[0060] In an optional embodiment, if Figure 2 As shown, a handle 115 is provided on the first panel 11. By providing the handle 115, the battery pack 100 can be easily taken out and placed.

[0061] In an optional embodiment, the handle 115 may be hinged on the first panel 11, and a groove for accommodating the handle 115 may be provided on the first panel 11. When the handle 115 is not in use, the handle 115 may be rotated into the groove for storage, which does not affect the normal use of the battery pack 100; when the handle 115 is needed, the handle 115 may be rotated out of the groove, and the battery pack 100 may be taken in and out through the handle 115, which is flexible and convenient to use.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (10), wherein a first panel (11) is provided with a first terminal (111) and a second terminal (112), the length direction of the first panel (11) is a first direction, and the first terminal (111) and the second terminal (112) are respectively located on two sides of the first panel (11) along the first direction; A battery module (20) is arranged in the box (10), and the battery module (20) comprises a plurality of battery cells (21) connected in series, the battery cell (21) located at the head end of the series loop is connected to a first output row (22), and the battery cell (21) located at the end of the series loop is connected to a second output row (23), the first output row (22) and the second output row (23) are respectively located on both sides of the battery module (20) along the first direction, the first output row (22) is electrically connected to the first terminal (111), and the second output row (23) is electrically connected to the second terminal (112).

2. The battery pack according to claim 1, characterized in that: A plurality of the battery cells (21) are laid flat and stacked.

3. The battery pack according to claim 2, characterized in that: The thickness direction of the battery core (21) is defined as a third direction, and a temperature averaging plate (27) is provided between two adjacent battery cores (21) in the third direction, and the temperature averaging plate (27) is in contact with a large surface of the battery core (21).

4. The battery pack according to claim 3, characterized in that: The temperature averaging plate (27) is hollow, and the interior of the temperature averaging plate (27) is filled with phase change material.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The first panel (11) is provided with a first communication port (113) and a second communication port (114); the first communication port (113) and the second communication port (114) are arranged at intervals along the height direction of the first panel (11).

6. The battery pack according to any one of claims 1 to 4, characterized in that: The battery module (20) further comprises a fixing belt (26) and two end plates (25); in the thickness direction of the battery cell (21), the two end plates (25) are arranged opposite to each other and at intervals; a plurality of the battery cells (21) are located between the two end plates (25); and the fixing belt (26) is sleeved on the two end plates (25).

7. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack comprises at least two groups of battery modules (20), and the at least two groups of battery modules (20) are arranged side by side and in series along the first direction. Among the battery modules (20) located at the two ends, one is provided with the first output row (22), and the other is provided with the second output row (23).

8. The battery pack according to any one of claims 1 to 4, characterized in that: The box body (10) further comprises an outer shell (12), and one end of the outer shell (12) is open; The battery pack further comprises a BMS module (30), wherein the BMS module (30) is arranged inside the outer shell (12) and close to an opening of the outer shell (12), and the BMS module (30) is provided with the first panel (11), wherein the first panel (11) is sealed at the open end of the outer shell (12) to form the closed box body (10).

9. An energy storage system, characterized in that: Comprising a plurality of battery packs as claimed in any one of claims 1 to 8, the plurality of battery packs are stacked and arranged in parallel along the height direction of the first panel (11), the first terminal heads (111) of the plurality of battery packs are located on the same side and connected by a first power line (200), and the second terminal heads (112) of the plurality of battery packs are located on the same side and connected by a second power line (300).

10. The energy storage system according to claim 9, characterized in that: The first panel (11) is provided with a first communication port (113) and a second communication port (114), and the first communication port (113) and the second communication port (114) are arranged at intervals along the height direction of the first panel (11); The first communication port (113) of one of the battery packs and the second communication port (114) of an adjacent battery pack are arranged adjacent to each other and are communicatively connected via a communication line (400).

Images