Energy storage device

Abstract

The utility model relates to the technical field of energy storage, and discloses energy storage equipment which comprises a plurality of battery modules stacked in the first direction and a plurality of first fixing parts, each battery module comprises a first metal shell and a grounding assembly, an insulating layer is arranged on the outer surface of the first metal shell, the grounding assembly is arranged on the first metal shell, and the insulating layer is arranged on the outer surface of the grounding assembly. The grounding assemblies of two adjacent battery modules are electrically connected; each first fixing piece is connected with at least two battery modules, the first fixing pieces are electrically connected with the first metal shell, and the plurality of battery modules are in equipotential connection.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of energy storage, in particular to an energy storage device. BACKGROUND

[0002] The energy storage device generally comprises a base, a plurality of battery modules and an electrical module. The plurality of battery modules are used for storing and releasing electric energy, and the electrical module is used for controlling and monitoring the plurality of battery modules. The energy storage device is generally applied in a high-voltage system, and therefore, the safety performance of the energy storage device is particularly important. SUMMARY

[0003] An object of embodiments of the present application is to provide an energy storage device capable of realizing grounding connection and equipotential connection of the base, the plurality of battery modules and the electrical module, so as to improve the safety performance of the energy storage device.

[0004] The energy storage device of embodiments of the present application comprises a plurality of battery modules stacked along a first direction and a plurality of first fixing members. Each battery module comprises a first metal shell and a grounding assembly. An outer surface of the first metal shell is provided with an insulating layer, and the grounding assembly is arranged on the first metal shell. The grounding assemblies of adjacent two battery modules are electrically connected. Each first fixing member is connected with at least two battery modules, and the first fixing member is electrically connected with the first metal shell. The plurality of battery modules are equipotentially connected. In the energy storage device of the present application, the plurality of battery modules can realize grounding connection through the grounding assemblies of each other, and can realize equipotential connection between the plurality of battery modules through the first fixing members. In addition, the first fixing members have a fixing effect on the plurality of battery modules, so as to improve the safety performance of the energy storage device and the stability of the structure.

[0005] In one or more embodiments, the grounding assembly in at least one battery module is electrically connected with the first metal shell of the battery module.

[0006] In one or more embodiments, the grounding assembly comprises a first connector, a second connector and a metal adapter. In the first direction, the first connector and the second connector are respectively arranged on two sides of the first metal shell. The first connector of one battery module is connected with the second connector of another battery module. The metal adapter is connected with the first metal shell and is electrically connected with the first metal shell. The first connector and the second connector are respectively connected with the metal adapter.

[0007] In one or more embodiments, the first connector comprises a first grounding terminal and a first wire harness. One end of the first wire harness is connected with the first grounding terminal, and the other end of the first wire harness is connected with the metal adapter. The second connector comprises a second grounding terminal and a second wire harness. One end of the second wire harness is connected with the second grounding terminal, and the other end of the second wire harness is connected with the metal adapter.

[0008] In one or more embodiments, the metal adapter includes a first portion connected with the first metal shell and a second portion connected with the first wire harness and the second wire harness; and / or, the first metal shell is partially configured as the metal adapter.

[0009] In one or more embodiments, the energy storage device includes a second fixing member fixed to the first metal shell, a first fixing member provided with a through hole, and a third fixing member fixed to the second fixing member through the through hole, the third fixing member fixing and electrically connecting the first fixing member with the first metal shell.

[0010] In one or more embodiments, the energy storage device includes an electrical module arranged on the top of the plurality of battery modules, the electrical module including a second metal shell, a third connector electrically connected with the grounding assembly of the adjacent battery module, and a fourth connector configured to be grounded with an external device.

[0011] In one or more embodiments, the third connector includes a third grounding terminal and a third wire harness, one end of the third wire harness being connected with the third grounding terminal and the other end of the third wire harness being electrically connected with the second metal shell; and the fourth connector includes a fourth grounding terminal and a fourth wire harness, one end of the fourth wire harness being connected with the fourth grounding terminal and the other end of the fourth wire harness being electrically connected with the second metal shell.

[0012] In one or more embodiments, the energy storage device includes a base arranged on the bottom of the plurality of battery modules, the base including a third metal shell and a fifth connector arranged on the third metal shell, the fifth connector including a fifth grounding terminal connected with the grounding assembly of the adjacent battery module and a sixth grounding terminal connected with the fifth grounding terminal and electrically connected with the third metal shell.

[0013] In one or more embodiments, the at least one first fixing member is fixedly connected with and electrically connected to the two battery modules spaced apart; and / or, the at least one first fixing member is fixedly connected with and electrically connected to the electrical module and the battery module on the top; and / or, the at least one first fixing member is fixedly connected with and electrically connected to the base and the battery module on the bottom. BRIEF DESCRIPTION OF DRAWINGS

[0014] One or more embodiments are illustrated by way of example in the figures that are part of this document and which illustrate embodiments, these illustrative examples do not limit the embodiments, elements having the same reference numerals in different figures represent similar elements.

[0015] Figure 1 is a structural schematic diagram of an energy storage device according to an embodiment of the present application;

[0016] Figure 2is a structural schematic diagram of a first metal shell omitted part of a battery module in the energy storage device of the embodiment of the present application;

[0017] Figure 3 is a structural schematic diagram of another view of the battery module in the energy storage device of the embodiment of the present application;

[0018] Figure 4 is Figure 1 is an enlarged schematic diagram of a local part A;

[0019] Figure 5 is a structural schematic diagram of a second metal shell omitted part of an electrical module in the energy storage device of the embodiment of the present application;

[0020] Figure 6 is a structural schematic diagram of a base in the energy storage device of the embodiment of the present application;

[0021] Figure 7 is Figure 6 is an enlarged schematic diagram of a local part B. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0023] It should be noted that when an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements can be present therebetween. In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] Please refer to Figure 1 and Figure 2The energy storage device 100 includes a plurality of battery modules 10 and a plurality of first fixing members 20. The plurality of battery modules 10 are arranged in a first direction Z, and each battery module 10 includes a first metal shell 11 and a grounding assembly 12. The outer surface of the first metal shell 11 is provided with an insulating layer 111. The grounding assembly 12 is arranged on the first metal shell 11, and the grounding assemblies 12 of adjacent two battery modules 10 are electrically connected to each other, so that all the plurality of battery modules 10 can be grounded. Each first fixing member 20 is connected to at least two battery modules 10, and the first fixing member 20 is electrically connected to the first metal shell 11, so that at least two battery modules 10 can be connected to the same potential. Through the above structure, the plurality of battery modules 10 in the energy storage device 100 of the present application can be grounded through the grounding assemblies 12 of each other, and the plurality of battery modules 10 can be connected to the same potential through the first fixing member 20. The first fixing member 20 has a fixing effect on the plurality of battery modules 10, so as to improve the safety performance and structural stability of the energy storage device 100.

[0025] In some embodiments, referring to Figure 2 , the grounding assembly 12 of at least one battery module 10 is electrically connected to the first metal shell 11 of the battery module 10. In this way, all battery modules 10 in the entire energy storage device 100 can be grounded while each battery module 10 is connected to the same potential.

[0026] In some embodiments, referring to Figure 2 and Figure 3 , the grounding assembly 12 includes a first connector 121, a second connector 122, and a metal adapter 123. In the first direction Z, the first connector 121 and the second connector 122 are arranged on both sides of the first metal shell 11. When two adjacent battery modules 10 are stacked, the first connector 121 of one battery module 10 and the second connector 122 of the other battery module 10 are connected to each other to connect the two adjacent battery modules 10. The first connector 121 and the second connector 122 transmit power and signals.

[0027] The metal adapter 123 is connected to the first metal shell 11, and the metal adapter 123 is electrically connected to the first metal shell 11. The first connector 121 and the second connector 122 are connected to the metal adapter 123, so that the first metal shell 11 is in a grounded state, and the safety performance of the battery module 10 is improved.

[0028] In some embodiments, referring to Figure 2 and Figure 3The first connector 121 comprises a first grounding terminal 1211 and a first wire harness 1212, one end of the first wire harness 1212 is connected with the first grounding terminal 1211, and the other end of the first wire harness 1212 is connected with the metal adapter 123. The second connector 122 comprises a second grounding terminal 1221 and a second wire harness 1222, one end of the second wire harness 1222 is connected with the second grounding terminal 1221, and the other end of the second wire harness 1222 is connected with the metal adapter 123. By connecting the first grounding terminal 1211 and the metal adapter 123 through the first wire harness 1212 and connecting the second grounding terminal 1221 and the metal adapter 123 through the second wire harness 1222, the connection difficulty of the first connector 121 and the second connector 122 with the metal adapter 123 can be reduced, and meanwhile, the layout of the metal adapter 123 is more reasonable.

[0029] In some embodiments, referring to Figure 2 The metal adapter 123 comprises a first part 1231 and a second part 1232 connected with each other. When the first part 1231 is connected with the first metal shell 11, the second part 1232 is in a protruding state, so as to facilitate the connection of the second part 1232 with the first wire harness 1212 and the second wire harness 1222 and reduce the connection difficulty. Optionally, the first part 1231 and the second part 1232 are connected in an "L" shape.

[0030] In some embodiments, referring to Figure 2 The metal adapter 123 is connected to the inner surface of the side wall of the first metal shell 11. The interior of the first metal shell 11 needs to be installed with parts such as the battery cell assembly and the control assembly, and the metal adapter 123 is arranged at the side wall of the first metal shell 11, so that the internal space of the first metal shell 11 can be reasonably utilized.

[0031] In some embodiments, part of the first metal shell 11 constitutes the metal adapter 123, and the first wire harness 1212 and the second wire harness 1222 are directly fixed with the first metal shell 11, which is beneficial to further reduce the size of the battery module 10.

[0032] In some embodiments, referring to Figure 4 The energy storage device 100 comprises a second fixing member 30 and a third fixing member 40. The second fixing member 30 is fixed to the first metal shell 11, and the second fixing member 30 has the function of being electrically connected with the first metal shell 11. The first fixing member 20 is provided with a through hole 21, and the third fixing member 40 is fixed with the second fixing member 30 after penetrating through the through hole 21, and the third fixing member 40 fixes and electrically connects the first fixing member 20 with the first metal shell 11. Among the two battery modules 10 connected by the first fixing member 20, the two first metal shells 11 are connected in an equipotential manner by the second fixing member 30, the third fixing member 40 and the first fixing member 20,

[0033] As an example, the first fixing member 20 is provided with a through hole 21, the second fixing member 30 is provided with a threaded hole, and the end of the third fixing member 40 is provided with a thread. After the third fixing member 40 passes through the through hole 21, it is screwed with the threaded hole of the second fixing member 30, so as to fix the first fixing member 20 to the first metal shell 11.

[0034] In some embodiments, referring to Figure 1 and Figure 5 , the energy storage device 100 includes an electrical module 50 arranged on the top of the plurality of battery modules 10. The electrical module 50 is configured to control the charging and discharging of the plurality of battery modules 10. The electrical module 50 includes a second metal shell 51, a third connector 52, and a fourth connector 53. The third connector 52 of the electrical module 50 is electrically connected to the ground assembly 12 of the adjacent battery module 10, and the fourth connector 53 is configured to be grounded with an external device, so that the electrical module 50 and the plurality of battery modules 10 are both grounded.

[0035] In some embodiments, referring to Figure 5 , the third connector 52 includes a third ground terminal 521 and a third wire harness 522, one end of the third wire harness 522 is connected to the third ground terminal 521, and the other end of the third wire harness 522 is electrically connected to the second metal shell 51. The fourth connector 53 includes a fourth ground terminal 531 and a fourth wire harness 532, one end of the fourth wire harness 532 is connected to the fourth ground terminal 531, and the other end of the fourth wire harness 532 is electrically connected to the second metal shell 51, so that the second metal shell 51 of the electrical module 50 can be grounded. The third ground terminal 521 is connected to the first ground terminal 1211 of the adjacent battery module 10.

[0036] In some embodiments, referring to Figure 1 and Figure 6 , the energy storage device 100 includes a base 60 arranged at the bottom of the plurality of battery modules 10. The base 60 is configured to support the plurality of battery modules 10 and the electrical module 50 located at the top. The base 60 includes a third metal shell 61 and a fifth connector 62, the fifth connector 62 is arranged on the third metal shell 61, and the fifth connector 62 is connected to the ground assembly 12 of the adjacent battery module 10.

[0037] Referring to Figure 7 , the fifth connector 62 includes a fifth ground terminal 621 and a sixth ground terminal 622, the fifth ground terminal 621 is connected to the ground assembly 12 of the adjacent battery module 10, the sixth ground terminal 622 is connected to the fifth ground terminal 621 and is connected to the third metal shell 61, and is electrically connected to the third metal shell 61, so that the third metal shell 61 of the base 60 is also grounded, improving the safety of the energy storage device 100.

[0038] In some embodiments, referring to Figure 1 , at least one first fixing member 20a is fixedly connected with two spaced battery modules 10a and electrically connected. Specifically, when a plurality of battery modules 10 are arranged in a stacked manner along a first direction Z, at least one first fixing member 20a spans three battery modules 10a, 10b and 10c, and one end of the first fixing member 20a is fixedly connected with one battery module 10a, and the other end of the first fixing member 20a is fixedly connected with another battery module 10c, and there is a third battery module 10b between the two battery modules 10a and 10c fixedly connected with the first fixing member 20a. Through such a structure, the first fixing member 20a can abut and limit the third battery module 10b in a second direction X, so as to enhance the connection stability of the plurality of battery modules 10. The first direction Z and the second direction X are perpendicular.

[0039] Further, when at least two first fixing members 20a and 20b are connected with two spaced battery modules 10 in the above manner, and the two first fixing members 20a and 20b are distributed in a staggered manner in the first direction Z, the two first fixing members 20a and 20b limit the plurality of battery modules 10 in the first direction Z, the second direction X and a third direction Y, further enhancing the firmness of the connection of the plurality of battery modules 10. The first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0040] In some embodiments, referring to Figure 1 , at least one first fixing member 20c is fixedly connected with the electrical module 50 and the battery module 10d at the top and electrically connected. The second metal shell 51 of the electrical module 50 is fixed with the first metal shell 11 of the adjacent battery module 10, and is connected to the same potential through the first fixing member 20, thereby improving the safety and connection stability of the electrical module 50 and the battery module 10.

[0041] In some embodiments, referring to Figure 1 , at least one first fixing member 20d is fixedly connected with the base 60 and the battery module 10e at the bottom and electrically connected. In this way, the third metal shell 61 of the base 60 is fixed with the first metal shell 11 of the adjacent battery module 10, and is connected to the same potential through the first fixing member 20, thereby improving the safety and connection stability of the base 60 and the battery module 10.

[0042] The above only discloses the preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application, so the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. An energy storage device, characterized by, The energy storage device comprises: a plurality of battery modules stacked in a first direction, each of the battery modules comprising a first metal shell and a grounding assembly, an outer surface of the first metal shell being provided with an insulating layer, the grounding assembly being arranged on the first metal shell, the grounding assemblies of adjacent two battery modules being electrically connected; a plurality of first fixing members, each of the first fixing members being connected with at least two battery modules, and the first fixing member being electrically connected with the first metal shell, the plurality of battery modules being connected at the same potential.

2. The energy storage device according to claim 1, wherein the grounding assembly of at least one of the battery modules is electrically connected with the first metal shell of the battery module.

3. The energy storage device according to claim 1, wherein the grounding assembly comprises a first connector, a second connector and a metal adapter, the first connector and the second connector being arranged on two sides of the first metal shell in the first direction, the first connector of one of the battery modules being connected with the second connector of another of the battery modules; the metal adapter is connected with the first metal shell and is electrically connected with the first metal shell, the first connector and the second connector being connected with the metal adapter respectively.

4. The energy storage device according to claim 3, wherein the first connector comprises a first grounding terminal and a first wire harness, one end of the first wire harness being connected with the first grounding terminal, the other end of the first wire harness being connected with the metal adapter; the second connector comprises a second grounding terminal and a second wire harness, one end of the second wire harness being connected with the second grounding terminal, the other end of the second wire harness being connected with the metal adapter.

5. The energy storage device according to claim 4, wherein the metal adapter comprises a first part and a second part, the first part being connected with the first metal shell, the second part being connected with the first wire harness and the second wire harness; and / or a part of the first metal shell constitutes the metal adapter.

6. The energy storage device according to any one of claims 1-5, wherein the energy storage device comprises a second fixing member and a third fixing member, the second fixing member being fixed to the first metal shell, the first fixing member being provided with a through hole, the third fixing member being fixed to the second fixing member through the through hole, the third fixing member fixing and electrically connecting the first fixing member with the first metal shell.

7. The energy storage device according to claim 6, wherein the energy storage device comprises an electrical module, the electrical module being arranged on a top of the plurality of battery modules, the electrical module comprising a second metal shell, a third connector and a fourth connector, the third connector being electrically connected with the grounding assembly of an adjacent battery module, the fourth connector being configured to be connected with an external device at the same potential.

8. The energy storage device according to claim 7, wherein ​ The third connector includes a third grounding terminal and a third wire harness, one end of the third wire harness is connected with the third grounding terminal, and the other end of the third wire harness is electrically connected with the second metal shell; The fourth connector includes a fourth grounding terminal and a fourth wire harness, one end of the fourth wire harness is connected with the fourth grounding terminal, and the other end of the fourth wire harness is electrically connected with the second metal shell.

9. The energy storage device of claim 7, wherein the energy storage device comprises a base disposed at a bottom of the plurality of battery modules, the base comprising a third metal shell and a fifth connector disposed at the third metal shell; The fifth connector includes a fifth grounding terminal and a sixth grounding terminal, the fifth grounding terminal is connected with the grounding assembly of the adjacent battery module, and the sixth grounding terminal is connected with the fifth grounding terminal and electrically connected with the third metal shell.

10. The energy storage device of claim 9, wherein at least one of the first fixing members is fixedly connected with and electrically connected to two of the battery modules that are spaced apart; and / or at least one of the first fixing members is fixedly connected with and electrically connected to the electrical module and the battery module located at the top; and / or at least one of the first fixing members is fixedly connected with and electrically connected to the base and the battery module located at the bottom. ​ ​ ​ ​

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