Battery pack and energy storage system

Abstract

The utility model relates to the technical field of energy storage, in particular to a battery pack and an energy storage system.The battery pack comprises a box body, a cover plate and a battery module; an opening is formed in the box body; the cover plate covers the opening side of the box body; the battery module is contained in the box body, the battery module comprises a battery cell assembly and two end plates, and the two end plates are arranged at the two ends of the battery cell assembly in the length direction in the horizontal direction respectively; wherein the end plate is clamped between the cover plate and the box body, so that the movement of the end plate in the vertical direction is limited, and a limiting piece is arranged on one side, facing the battery module, of the cover plate and / or the box body in the vertical direction so as to limit the movement of the end plate in the horizontal direction. According to the battery pack, the limiting piece for limiting the battery module to move in the horizontal direction is arranged on the cover plate and / or the box body, and the cover plate and the box body are matched to limit the battery module to move in the vertical direction, so that the mounting steps of the battery pack are simplified, and the mounting difficulty of the battery pack is reduced.

Description

Technical Field

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

[0002] The battery pack is an important component of the energy storage system, which is used to store or output electrical energy. The battery pack includes a box, a battery module and a cover plate. The battery module is arranged in the box, and the box has an opening for the battery module to be installed. The cover plate is covered on the opening and fixedly connected to the box.

[0003] In the prior art, the battery module is fixed to the bottom wall of the box by bolts. The assembly process of the battery pack is as follows: first, the end plate of the battery module is fixed to the bottom of the box by bolts to realize the assembly of the battery module and the box, and then the cover plate is fixed to the box by bolts. The above-mentioned fixing method of the battery module is difficult and cumbersome, and is not convenient for the rapid disassembly and assembly of the battery pack. Utility Model Content

[0004] The present application provides a battery pack and an energy storage system, which can improve the convenience of disassembly and assembly of battery modules in the battery pack.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising:

[0006] A box body having an opening thereon;

[0007] A cover plate, arranged on the opening side of the box body;

[0008] A battery module is contained in the box, and the battery module includes a battery cell assembly and two end plates, and the two end plates are respectively arranged at two ends of the length direction of the battery cell assembly along the horizontal direction; wherein,

[0009] The end plate is clamped between the cover plate and the box body so that the movement of the end plate in the vertical direction is restricted. The cover plate and / or the box body is provided with a limiting member on one side of the battery module in the vertical direction so as to restrict the movement of the end plate in the horizontal direction.

[0010] In some embodiments, the position-limiting member is a positioning pin, the end plate is provided with a positioning hole adapted to the positioning pin, and the positioning pin is inserted into the positioning hole; or,

[0011] The limiting member is provided with a positioning hole, and the end plate is provided with a positioning pin adapted to the positioning hole, and the positioning pin is inserted into the positioning hole.

[0012] In some embodiments, the bottom of the cover plate and the bottom wall of the box body are both provided with the limiting member, the limiting member of the bottom wall of the box body is a first positioning pin, and the limiting member of the bottom of the cover plate is a second positioning pin, the lower end of the end plate is provided with a first positioning hole adapted to the first positioning pin, and the upper end of the end plate is provided with a second positioning hole adapted to the second positioning pin, the first positioning pin is inserted in the first positioning hole, and the second positioning pin is inserted in the second positioning hole.

[0013] In some embodiments, there are multiple first locating pins and multiple second locating pins, and both end plates are provided with the first locating holes and the second locating holes. The first locating pins and the first locating holes are provided in a one-to-one correspondence, and the second locating pins and the second locating holes are provided in a one-to-one correspondence.

[0014] In some embodiments, two mounting beams are disposed on the inner bottom wall of the box body, the two mounting beams are disposed one-to-one below the two end plates, and the first positioning pin is disposed on the mounting beams.

[0015] In some embodiments, the second positioning hole and the first positioning hole are symmetrically arranged at the upper and lower ends of the end plate, and a plurality of the first positioning pins are symmetrically arranged on the two mounting beams.

[0016] In some embodiments, the first locating pin and the first locating hole are interference fit; and / or,

[0017] The second positioning pin and the second positioning hole are interference fit.

[0018] In some embodiments, the first positioning pin is tapered, and the axial cross-sectional area of ​​the first positioning pin gradually increases from top to bottom; and / or,

[0019] The second positioning pin is in a cone shape, and the axial cross-sectional cotton neps of the second positioning pin gradually decrease from top to bottom.

[0020] In some embodiments, the axial cross-section of the positioning pin is circular, elliptical or polygonal.

[0021] In a second aspect, the present application further proposes an energy storage system, which includes a battery pack as described in the first aspect.

[0022] Compared with the prior art, this technical solution has at least the following technical effects:

[0023] The technical solution of the present application simplifies the installation steps of the battery pack and reduces the difficulty of installing the battery pack by setting a limiter on the cover plate and / or the box body to limit the movement of the battery module in the horizontal direction, and limiting the movement of the battery module in the vertical direction by the cooperation of the cover plate and the box body. During the installation process of the battery pack of the present application, the battery module is first placed in a preset installation position in the box body, and then the cover plate is fixed to the box body. At this time, the limiter cooperates with the battery module to limit the movement of the battery module in the horizontal direction, and the battery module is clamped between the cover plate and the box body, so that the movement of the battery module in the vertical direction is limited, thereby fixing the battery module in the preset installation position in the box body. The installation method of the battery pack of the present application is quick and simple, and there is no need to use bolts to fix the cover plate and the box body, which solves the problems of difficult bolt fixing operation and cumbersome steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of a battery pack in one embodiment of the present application;

[0026] Figure 2 yes Figure 1 Cross-sectional view of the battery pack.

[0027] Reference numerals:

[0028] 100 Battery Pack 111 Cabinet 111a Opening 112 Installing beams 113 First positioning pin (limiting piece) 121 Cover 122 Second positioning pin (limiting piece) 130 Battery Module 131 Battery Cell Components 132 End Plate 132a The first positioning hole 132b Second positioning hole 1321 First end plate 1322 Second end plate DETAILED DESCRIPTION

[0029] In order to better understand the technical solution of the present utility model, the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0030] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0032] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] The battery pack is an important component of the energy storage system, which is used to store or output electrical energy. The battery pack includes a box, a battery module and a cover plate. The battery module is arranged in the box, and the box has an opening for the battery module to be installed. The cover plate is covered on the opening and fixedly connected to the box.

[0034] In the prior art, the battery module is fixed to the bottom wall of the box by bolts. The assembly process of the battery pack is as follows: first, the end plate of the battery module is fixed to the bottom of the box by bolts to realize the assembly of the battery module and the box, and then the cover plate is fixed to the box by bolts. The above-mentioned fixing method of the battery module has at least the following problems: (1) After the battery module is placed in the preset installation position in the box, the distance between the battery module and the side wall of the box is small, which makes it inconvenient for the installer to reach into the box to fix the battery module and the box with bolts; (2) The assembly process is cumbersome and it is not convenient for the battery pack to be quickly disassembled and assembled.

[0035] In order to solve the above technical problems, the present application proposes a battery pack 100 .

[0036] For ease of description, the length direction of the battery pack 100 is defined as the X-axis direction, the width direction of the battery pack 100 is defined as the Y-axis direction, and the height direction of the battery pack 100 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0037] The directional terms such as “upper”, “lower”, “top”, “bottom”, “left”, “right”, “front” and “rear” used in describing the battery pack 100 in the embodiment of the present application are mainly based on the position of the battery pack 100 in the attached Figure 1 The display orientation is explained in the figure, with the positive direction of the Z axis being the "top" and "upper", the negative direction of the Z axis being the "bottom" and "lower", the positive direction of the X axis being the "right", the negative direction of the X axis being the "left", the positive direction of the Y axis being the "back", and the negative direction of the Y axis being the "front". It does not constitute a limitation on the orientation of the battery pack 100 in actual application scenarios.

[0038] See also Figure 1 and Figure 2In the embodiment of the present application, the battery pack 100 includes a box body 111, a cover plate 121 and a battery module 130; the top of the box body 111 is provided with an opening 111a, and the cover plate 121 is provided on the side of the opening 111a of the box body 111; the battery module 130 is accommodated in the box body 111, and the battery module 130 includes a battery cell assembly 131 and two end plates 132, and the battery cell assembly 131 includes a plurality of battery cells arranged in sequence along the X-axis direction. The two end plates 132 are respectively arranged at the two ends of the battery cell assembly 131 along the X-axis direction; wherein the end plates 132 are clamped between the cover plate 121 and the box body 111 so that the movement of the end plates 132 in the vertical direction is restricted, and the cover plate 121 and / or the box body 111 are provided with a limiting member 122 (or 113) on one side toward the battery module 130 in the vertical direction to restrict the movement of the end plates 132 in the horizontal direction.

[0039] The technical solution of the present application simplifies the installation steps of the battery pack 100 and reduces the difficulty of installing the battery pack 100 by setting a limiter 122 (or 113) on the cover 121 and / or the box body 111 to limit the horizontal movement of the battery module 130, and limits the vertical movement of the battery module 130 through the cooperation of the cover 121 and the box body 111. During the installation of the battery pack 100 of the present application, the battery module 130 is first placed in the preset installation position in the box 111, and then the cover 121 is fixed to the box 111. At this time, the limiter 122 (or 113) cooperates with the battery module 130 to limit the horizontal movement of the battery module 130, and the battery module 130 is clamped between the cover 121 and the box 111, so that the vertical movement of the battery module 130 is limited, so that the battery module 130 is fixed at the preset installation position in the box 111. The installation method of the battery pack 100 of the present application is quick and simple, and there is no need to use bolts to fix the cover 121 to the box 111, which solves the problems of difficult bolt fixing operation and cumbersome steps.

[0040] It can be understood that when a limiting member 122 (or 113) is provided on one of the box body 111 or the cover plate 121 to limit the battery module 130 in the horizontal direction, the other one directly abuts against the box body 111 or indirectly abuts against the box body 111 through an abutting member, thereby realizing the vertical limitation of the box body 111. When limiting members 122 (or 113) are provided on both the box body 111 and the cover plate 121, the limiting members 122 (or 113) on the box body 111 and the cover plate 121 both limit the horizontal movement of the battery module 130, and the battery module 130 is sandwiched between the limiting members 122 (or 113) of the box body 111 and the cover plate 121, so that the vertical movement of the battery module 130 is limited.

[0041] The following further describes the embodiment of the present application by taking the example that both the box body 111 and the cover plate 121 are provided with the limiting members 122 (or 113 ).

[0042] In this embodiment, the limiting member 122 (or 113) may be a positioning member such as a positioning pin, a limiting frame, or a positioning block with a positioning hole.

[0043] For ease of description, the two end plates 132 in the battery module 130 are respectively referred to as a first end plate 1321 and a second end plate 1322 , wherein the first end plate 1321 and the second end plate 1322 are respectively located on the left and right sides of the battery cell assembly 131 .

[0044] See also Figure 2 When the stopper 122 (or 113) is a positioning pin, a positioning hole matching the positioning pin is provided on the first end plate 1321 and / or the second end plate 1322. For the convenience of description, the positioning pin on the box body 111 is recorded as the first positioning pin 113, and the positioning pin on the cover plate 121 is recorded as the second positioning pin 122. The bottom of the inner side of the box body 111 is provided with a first positioning pin 113, and the lower end of the first end plate 1321 and / or the second end plate 1322 is provided with a first positioning hole 132a matching the first positioning pin 113, and the first positioning pin 113 is inserted into the first positioning hole 132a; the bottom of the cover plate 121 is provided with a second positioning pin 122, and the upper end of the first end plate 1321 and / or the second end plate 1322 is provided with a second positioning hole 132b matching the second positioning pin 122, and the second positioning pin 122 is inserted into the second positioning hole 132b.

[0045] Among them, the first positioning hole 132a and the second positioning hole 132b can be opened on the first end plate 1321 or the second end plate 1322, and the first positioning hole 132a and the second positioning hole 132b can also be opened on the first end plate 1321 and the second end plate 1322 respectively; correspondingly, the second positioning pin 122 and the first positioning pin 113 can be located at the corresponding positions of the upper and lower ends of the first end plate 1321 or the second end plate 1322 respectively, and one of the first positioning pin 113 and the second positioning pin 122 can also be located at the corresponding positions of the upper and lower ends of the first end plate 1321, and the other one is located at the corresponding positions of the upper and lower ends of the second end plate 1322.

[0046] During the installation process, the battery module 130 is first placed in the preset installation position in the box 111. In the preset installation position, the first positioning pin 113 is inserted into the first positioning hole 132a. The first positioning pin 113 will limit the horizontal movement of the battery module 130. Then, the cover plate 121 is covered at the opening 111a so that the second positioning pin 122 is inserted into the second positioning hole 132b. Then, the cover plate 121 is fixed to the box 111 by bolts. The first positioning pin 113 and the second positioning pin 122 lock the position of the battery module 130, so that the battery module 130 is fixed in the preset installation position.

[0047] Furthermore, the first positioning pin 113 and the first positioning hole 132a are interference fit, and the second positioning pin 122 and the second positioning hole 132b are interference fit. By making the corresponding positioning pins and positioning holes interference fit, the assembly stability of the battery module 130 and the box 111 can be further improved.

[0048] Furthermore, in order to facilitate the insertion of the first positioning pin 113 into the first positioning hole 132a and the insertion of the second positioning pin 122 into the second positioning hole 132b, the first positioning pin 113 and the second positioning pin 122 are both conical structures, and the axial cross-sectional area of ​​the first positioning pin 113 gradually increases from top to bottom, and the axial cross-sectional area of ​​the second positioning pin 122 gradually decreases from top to bottom.

[0049] The axial cross-sections of the first positioning pin 113 and the second positioning pin 122 may be circular, elliptical, polygonal, etc., which is not limited in this embodiment.

[0050] Continue reading Figure 2The number of the first positioning pin 113 and the second positioning pin 122 can be one or more. In order to improve the assembly stability of the battery module 130 and the box body 111, preferably, the number of the first positioning pin 113 and the second positioning pin 122 are both multiple.

[0051] When the number of the first positioning pins 113 and the second positioning pins 122 is multiple, correspondingly, the number of the first positioning holes 132a and the second positioning holes 132b is also multiple, the first positioning pins 113 and the first positioning holes 132a are arranged in a one-to-one correspondence, and the second positioning pins 122 and the second positioning holes 132b are arranged in a one-to-one correspondence.

[0052] A plurality of first positioning pins 113 may be simultaneously disposed at corresponding positions below the first end plate 1321 / second end plate 1322 or respectively disposed at corresponding positions below the first end plate 1321 and the second end plate 1322, and a plurality of second positioning pins 122 may be simultaneously disposed at corresponding positions above the first end plate 1321 / second end plate 1322 or respectively disposed at corresponding positions above the first end plate 1321 and the second end plate 1322.

[0053] In order to further improve the assembly stability of the battery module 130 and the box body 111, preferably, the number of the first positioning pins 113 and the second positioning pins 122 are both multiple, and at least one first positioning pin 113 is arranged below the first end plate 1321 and the second end plate 1322, and at least one second positioning pin 122 is arranged above the first end plate 1321 and the second end plate 1322.

[0054] In order to further improve the assembly stability of the battery module 130 and the box body 111, a plurality of first positioning pins 113 are symmetrically arranged below the first end plate 1321 and the second end plate 1322, and a plurality of second positioning pins 122 are symmetrically arranged above the first end plate 1321 and the second end plate 1322. Correspondingly, a plurality of first positioning holes 132a are symmetrically opened at the lower ends of the first end plate 1321 and the second end plate 1322, and a plurality of second positioning holes 132b are symmetrically opened at the upper ends of the first end plate 1321 and the second end plate 1322.

[0055] In order to further improve the assembly stability of the battery module 130 and the box body 111, the first positioning hole 132a and the second positioning hole 132b are arranged in a one-to-one correspondence, and a part of the second positioning hole 132b and the first positioning hole 132a are symmetrically opened at the upper and lower ends of the first end plate 1321, and another part of the second positioning hole 132b and the first positioning hole 132a are symmetrically opened at the upper and lower ends of the second end plate 1322.

[0056] When the position-limiting member 122 (or 113) is a positioning block with a positioning hole, a positioning pin matched with the positioning hole is provided on the end plate 132, and the positioning block can be integrally formed with the inner bottom wall of the box body 111 or formed separately. The specific implementation of the position-limiting member 122 (or 113) being a positioning block with a positioning hole can refer to the implementation of the position-limiting member 122 (or 113) being a positioning pin, which will not be described in detail in this embodiment.

[0057] When the limiting member 122 (or 113) is a limiting frame, the limiting member 122 (or 113) includes a plurality of limiting blocks, and the plurality of limiting blocks enclose the limiting frame. For example, the limiting member 122 (or 113) includes four limiting blocks, and the four limiting blocks enclose the limiting frame. Specifically, the bottom of the box body 111 is provided with four first limiting blocks enclosing the first limiting frame, and the lower end of the cover body is provided with four second limiting blocks enclosing the second limiting frame; the lower end of the battery module 130 is provided at In the first limiting frame, two first limiting blocks respectively cover the left front corner and the left rear corner of the lower end of the first end plate 1321, and the other two first limiting blocks respectively cover the right front corner and the right rear corner of the lower end of the second end plate 1322; the upper end of the battery module 130 is set in the second limiting frame, wherein the two second limiting blocks respectively cover the left front corner and the left rear corner of the upper end of the first end plate 1321, and the other two second limiting blocks respectively cover the right front corner and the right rear corner of the upper end of the second end plate 1322. During the installation process, the lower end of the battery module 130 is first placed in the first limiting frame, and the first limiting frame limits the horizontal movement of the battery module 130, and then the cover plate 121 is covered at the opening 111a at the upper end of the box body 111, so that the upper end of the battery module 130 is placed in the second limiting frame, and then the box body 111 and the cover plate 121 are fixed with screws.

[0058] In this embodiment, a mounting beam 112 is provided at the bottom of the box body 111, the battery module 130 is provided on the mounting beam 112, and the position limiting member 122 (or 113) (such as the first positioning pin 113, the first position limiting block) below the battery module 130 is provided on the mounting beam 112. Specifically, there are two mounting beams 112, and the two mounting beams 112 are respectively provided below the first end plate 1321 and the second end plate 1322, and the position limiting members 122 (or 113) below the first end plate 1321 are respectively installed on the two mounting beams 112.

[0059] Secondly, the present application also proposes an energy storage system, which includes a plurality of battery packs 100. The specific structure of the battery pack 100 refers to the above-mentioned embodiment. Since the present energy storage system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body having an opening thereon; A cover plate, which is arranged on the opening side of the box body; A battery module is contained in the box, and the battery module includes a battery cell assembly and two end plates, and the two end plates are respectively arranged at two ends of the length direction of the battery cell assembly along the horizontal direction; wherein, The end plate is clamped between the cover plate and the box body so that the movement of the end plate in the vertical direction is restricted. The cover plate and / or the box body is provided with a limiting member on one side of the battery module in the vertical direction so as to restrict the movement of the end plate in the horizontal direction.

2. The battery pack according to claim 1, characterized in that: The position-limiting member is a positioning pin, the end plate is provided with a positioning hole adapted to the positioning pin, and the positioning pin is inserted into the positioning hole; or, The limiting member is provided with a positioning hole, and the end plate is provided with a positioning pin adapted to the positioning hole, and the positioning pin is inserted into the positioning hole.

3. The battery pack according to claim 2, characterized in that: The bottom of the cover plate and the bottom wall of the box body are both provided with the limiting parts, the limiting part of the bottom wall of the box body is a first positioning pin, and the limiting part of the bottom of the cover plate is a second positioning pin. The lower end of the end plate is provided with a first positioning hole adapted to the first positioning pin, and the upper end of the end plate is provided with a second positioning hole adapted to the second positioning pin, the first positioning pin is inserted in the first positioning hole, and the second positioning pin is inserted in the second positioning hole.

4. The battery pack according to claim 3, characterized in that: There are multiple first positioning pins and multiple second positioning pins, and both end plates are provided with the first positioning holes and the second positioning holes. The first positioning pins and the first positioning holes are provided in a one-to-one correspondence, and the second positioning pins and the second positioning holes are provided in a one-to-one correspondence.

5. The battery pack according to claim 4, characterized in that: Two mounting beams are arranged on the bottom wall of the box body, and the two mounting beams are arranged under the two end plates in a one-to-one correspondence, and the first positioning pin is arranged on the mounting beams.

6. The battery pack according to claim 5, characterized in that: The second positioning hole and the first positioning hole are symmetrically arranged at the upper and lower ends of the end plate, and a plurality of the first positioning pins are symmetrically arranged on the two mounting beams.

7. The battery pack according to claim 3, characterized in that: The first positioning pin and the first positioning hole are interference fit; and / or, The second positioning pin and the second positioning hole are interference fit.

8. The battery pack according to claim 3, characterized in that: The first positioning pin is tapered, and the axial cross-sectional area of ​​the first positioning pin gradually increases from top to bottom; and / or, The second positioning pin is in a cone shape, and the axial cross-sectional cotton neps of the second positioning pin gradually decrease from top to bottom.

9. The battery pack according to claim 2, characterized in that: The axial cross section of the positioning pin is in the shape of a circle, an ellipse or a polygon.

10. An energy storage system, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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