Battery pack and energy storage device

Abstract

The utility model discloses a battery pack and an energy storage device. The battery pack comprises a first fastener, a second fastener, a first shell, a second shell and a liquid cooling plate, wherein the first shell, the second shell and the liquid cooling plate define a containing cavity, and the containing cavity is used for containing a battery module; the first shell is connected with the liquid cooling plate through a first fastener; the second shell is connected with the first shell through a second fastening piece, and the second fastening piece is parallel to the first fastening piece. The energy storage device comprises the battery pack. According to the battery pack, the sealing performance of the battery pack can be ensured. The utility model is applied to the technical field of power energy storage.

Description

Technical Field

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

[0002] In related technologies, industrial, commercial, and large-scale containerized energy storage primarily utilizes liquid-cooled battery packs. These typically consist of two 1P26S or four 1P13S modules, forming a 52S1P battery pack. The overall protection level of the battery pack has also been upgraded from the previous air-cooled IP54 to a liquid-cooled IP67. To achieve this high protection level, the design and installation of the battery pack cover and liquid cooling plate are particularly important.

[0003] In the related art, the installation method of the battery pack generally includes the following steps: driving screws into the mounting plate and the PP upper cover in the horizontal direction to fix the PP upper cover to the front mounting plate; and driving screws into the liquid cooling plate and the front mounting plate in the vertical direction to fix the front mounting plate to the liquid cooling plate. In this installation method, the screws at the two mounting positions are perpendicular to each other, and the installation directions of the screws at the two mounting positions are also perpendicular to each other during installation, which will affect the sealing of the finished battery pack. For example, when driving screws into the front mounting plate and the PP upper cover in the horizontal direction, since the bottom of the front mounting plate is connected to the liquid cooling plate by vertically arranged bolts, the front mounting plate will undergo a certain horizontal deformation under the action of horizontal force, thereby reducing the sealing between the front mounting plate and the liquid cooling plate, resulting in the battery pack's sealing failing to meet the IP67 requirements.

[0004] In addition, during the installation of some battery packs, when connecting the module's total positive and negative connection copper plates with the shell's total positive and negative connectors, it is easy to accidentally touch them, resulting in the total positive and negative connection of the battery pack and causing a short circuit. Utility Model Content

[0005] The present application aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the first embodiment of the present application provides a battery pack that can ensure the sealing performance of the battery pack.

[0006] A second embodiment of the present application provides an energy storage device having the above-mentioned battery pack.

[0007] According to the battery pack of the embodiment of the first aspect of the present application, it includes: a first shell, a second shell and a liquid cooling plate that enclose a accommodating cavity, wherein the accommodating cavity is used to accommodate a battery module; a first fastener, through which the first shell is connected to the liquid cooling plate; a second fastener, through which the second shell is connected to the first shell, and the second fastener is parallel to the first fastener.

[0008] Based on the above technical solution, the embodiments of the present application have at least the following beneficial effects: the first shell in the embodiments of the present application is connected to the liquid cooling plate through a first fastener, and the second shell is connected to the first shell through a second fastener, and the second fastener is parallel to the first fastener. Therefore, when installing the first fastener and the second fastener, there is no component force in other directions, which will not cause the outer shell of the battery pack to deform and affect the sealing, thereby enhancing the sealing performance of the battery pack.

[0009] According to the battery pack of the embodiment of the first aspect of the present application, a first connecting portion and a second connecting portion are provided on the first shell, the first fastener is passed through the first connecting portion to be connected to the liquid cooling plate, and the second fastener is passed through the second shell to be connected to the second connecting portion.

[0010] According to the battery pack of the embodiment of the first aspect of the present application, the first connecting portion is arranged at an end of the first shell close to the liquid cooling plate, the second connecting portion is arranged at an end of the first shell close to the second shell, and the first connecting portion and the second connecting portion are both flanges, and the flanges are turned outward relative to the side wall of the first shell.

[0011] According to the battery pack of the embodiment of the first aspect of the present application, a first seal is provided between the first shell and the liquid cooling plate, and a second seal is provided between the first shell and the second shell.

[0012] According to the battery pack of the embodiment of the first aspect of the present application, the battery pack further includes components, and the components are installed on the first shell.

[0013] According to the battery pack of the embodiment of the first aspect of the present application, the components include a first total positive copper plate, a total positive connector, a first total negative copper plate and a total negative connector, the first total positive copper plate is connected to the total positive connector, and the first total negative copper plate is connected to the total negative connector.

[0014] According to the battery pack of the embodiment of the first aspect of the present application, the battery module includes a second total positive copper plate and a second total negative copper plate, the distance between the second total positive copper plate and the second total negative copper plate is greater than 500 mm, the second total positive copper plate is connected to the first total positive copper plate, and the second total negative copper plate is connected to the first total negative copper plate.

[0015] According to the battery pack of the embodiment of the first aspect of the present application, the battery pack further includes a maintenance cover, the first shell is provided with a maintenance opening, and the maintenance cover is installed at the maintenance opening of the first shell to shield the maintenance opening.

[0016] According to the battery pack of the embodiment of the first aspect of the present application, a third seal is provided between the maintenance cover and the first shell.

[0017] The energy storage device according to the second embodiment of the present application includes the above-mentioned battery pack.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application is further described below with reference to the accompanying drawings and embodiments;

[0020] Figure 1 This is a schematic diagram of the structure of the battery pack in the embodiment of the present application;

[0021] Figure 2 This is an exploded view of the battery pack in the embodiment of the present application;

[0022] Figure 3 This is a schematic structural diagram of the first shell in an embodiment of the present application;

[0023] Figure 4 This is another structural schematic diagram of the first shell in the embodiment of the present application;

[0024] Figure 5 This is another structural schematic diagram of the first shell in the embodiment of the present application.

[0025] Reference numerals:

[0026] Liquid cooling plate 100; first shell 210, first connecting part 220, second connecting part 230, maintenance cover 240; second shell 300; first fastener 410, second fastener 420, third fastener 430; first seal 510, second seal 520; first total positive copper plate 611, total positive connector 612, first total negative copper plate 621, total negative connector 622, BMU 631, BMU communication connector 632, BMU internal communication harness 633, PACK internal fire detector 641, fire nozzle 642, fire communication connector 643, fuse 650, MSD 661, connecting copper plate 662, explosion-proof valve 670; battery module 700. DETAILED DESCRIPTION

[0027] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0028] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0029] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0030] In the description of this application, unless otherwise clearly defined, words such as setting and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above words in this application based on the specific content of the technical solution.

[0031] The technical solution of the present application will be further described below with reference to the embodiments and drawings.

[0032] In the embodiment of the present application, the positive direction of the X-axis in the drawings is taken as the left, and the negative direction of the X-axis is taken as the right; the positive direction of the Y-axis is taken as the front, and the negative direction of the Y-axis is taken as the back; the positive direction of the Z-axis is taken as the top, and the negative direction of the Z-axis is taken as the bottom.

[0033] See also Figure 1 and Figure 2 The first embodiment of the present application provides a battery pack that can ensure the sealing performance of the battery pack.

[0034] See also Figure 1 and Figure 2 The battery pack includes a first housing 210, a second housing 300, and a liquid cooling plate 100, which enclose a housing cavity. The battery pack also includes a first fastener 410 and a second fastener 420. The housing cavity is used to accommodate the battery module 700. The first housing 210 is connected to the liquid cooling plate 100 via the first fastener 410; the second housing 300 is connected to the first housing 210 via the second fastener 420, which is parallel to the first fastener 410.

[0035] In the embodiment of the present application, the first shell 210 is connected to the liquid cooling plate 100 via a first fastener 410, and the second shell 300 is connected to the first shell 210 via a second fastener 420. The second fastener 420 is parallel to the first fastener 410. Therefore, when the first fastener 410 and the second fastener 420 are installed, there is no component force in other directions, which will not cause the outer shell of the battery pack to deform and affect the sealing, thereby enhancing the sealing performance of the battery pack.

[0036] Illustratively, the second housing 300, first housing 210, and liquid cooling plate 100 are arranged sequentially from top to bottom, with the first housing 210 serving as the middle housing and the second housing 300 serving as the upper housing. Optionally, the first housing 210 includes four circumferentially connected side walls. Optionally, the four side walls are integrally formed. Optionally, both the first housing 210 and the second housing 300 are made of sheet metal.

[0037] Of course, the second shell 300 , the first shell 210 and the liquid cooling plate 100 may also be arranged in the horizontal direction, which is not specifically limited here.

[0038] Optionally, in some embodiments, a first connecting portion 220 and a second connecting portion 230 are provided on the first shell 210, the first fastener 410 is passed through the first connecting portion 220 to connect to the liquid cooling plate 100, and the second fastener 420 is passed through the second shell 300 to connect to the second connecting portion 230.

[0039] Optionally, in some embodiments, the first connection portion 220 is arranged at one end of the first shell 210 close to the liquid cooling plate 100, and the second connection portion 230 is arranged at one end of the first shell 210 close to the second shell 300, and the first connection portion 220 and the second connection portion 230 are both flanges, and the flanges are turned outward relative to the side wall of the first shell 210.

[0040] For example, see Figure 3 The first connecting portion 220 is disposed at the lower end of the first housing 210, and the second connecting portion 230 is disposed at the upper end of the first housing 210. The first connecting portion 220 and the second connecting portion 230 are both arranged in a circle around the outer circumference of the first housing 210 to ensure a tight connection. Optionally, the first connecting portion 220, the second connecting portion 230, and the first housing 210 are integrally formed.

[0041] Alternatively, in some embodiments, see Figure 2 A first sealing member 510 is provided between the first shell 210 and the liquid cooling plate 100 , and a second sealing member 520 is provided between the first shell 210 and the second shell 300 .

[0042] Optionally, the first sealing member 510 and the second sealing member 520 are both silicone sealing strips. Optionally, the first fastener 410 and the second fastener 420 are both fastening bolts. For example, the liquid cooling plate 100 is circumferentially provided with a plurality of first mounting holes, in which a first rivet nut is installed. The first fastener 410 can sequentially pass through the first connecting portion 220 and the first sealing member 510 to cooperate with the first rivet nut in the first mounting hole, thereby mounting the first housing 210 on the liquid cooling plate 100. The second connecting portion 230 is circumferentially provided with a plurality of second mounting holes, in which a second rivet nut is installed. The second fastener 420 can sequentially pass through the second housing 300 and the second sealing member 520 to cooperate with the second rivet nut in the second mounting hole, thereby mounting the second housing 300 on the first housing 210.

[0043] Optionally, when installing the first fastener 410 and the second fastener 420, the first seal 510 and the second seal 520 may be compressed to enhance sealing performance. Optionally, the first seal 510 and the second seal 520 may be compressed by 50% to achieve better sealing performance. For example, the thickness of the first seal 510 and the second seal 520 may be 3 mm to 4 mm. After installing the first fastener 410 and the second fastener 420, the thickness of the first seal 510 and the second seal 520 are compressed to 1.5 mm to 2 mm.

[0044] Optionally, in some embodiments, the battery pack further includes components, which are mounted on the first housing 210. Alternatively, the components are mounted on the front sidewall of the first housing 210. When assembling the battery pack, the components can be pre-installed on the first housing 210, thereby improving assembly efficiency on the production line.

[0045] Alternatively, in some embodiments, see Figure 4 and Figure 5 The components include a first total positive copper plate 611, a total positive connector 612, a first total negative copper plate 621 and a total negative connector 622. The first total positive copper plate 611 is connected to the total positive connector 612, and the first total negative copper plate 621 is connected to the total negative connector 622.

[0046] Optionally, the components may also include a BMU 631, a BMU communication connector 632, a BMU internal communication harness 633, a PACK internal fire detector 641, a fire nozzle 642, a fire communication connector 643, a fuse 650 and a support assembly, an MSD 661, a connecting copper plate 662, and an explosion-proof valve 670. The connecting copper plate 662 is used to connect the MSD 661 to the first main positive copper plate 611.

[0047] Alternatively, in some embodiments, see Figure 2The battery pack also includes a battery module 700, which includes a second total positive copper plate and a second total negative copper plate. The distance between the second total positive copper plate and the second total negative copper plate is greater than 500 mm. The second total positive copper plate is connected to the first total positive copper plate 611, and the second total negative copper plate is connected to the first total negative copper plate 621. Optionally, the second total positive copper plate and the second total negative copper plate can be installed on the left and right ends of the battery module 700, respectively.

[0048] When installing the battery pack in the related art, the first total positive copper plate 611 is generally locked on the total positive connector 612, and the first total negative copper plate 621 is generally locked on the total negative connector 622. The distance between the total positive connector 612 and the total negative connector 622 is generally less than 50 mm, which makes it easy to accidentally touch and cause a short circuit during the installation process.

[0049] In the embodiment of the present application, the first total positive copper plate 611, the total positive connector 612, the first total negative copper plate 621 and the total negative connector 622 can be pre-installed on the first shell 210 and connected, and the distance between the second total positive copper plate and the second total negative copper plate is greater than 500 mm, which can prevent the battery pack from accidentally contacting during the installation process and causing a short circuit safety accident.

[0050] Alternatively, in some embodiments, see Figure 3 The battery pack further includes a maintenance cover 240 . The first housing 210 has a maintenance opening, and the maintenance cover 240 is installed at the maintenance opening of the first housing 210 to shield the maintenance opening. Optionally, the maintenance cover 240 is connected to the first housing 210 via a third fastener 430 .

[0051] Optionally, in some embodiments, a third sealing member is provided between the maintenance cover 240 and the first housing 210. Optionally, the third sealing member may also be a silicone sealing strip.

[0052] Similarly, when installing the third fastener 430, the third seal can be compressed to enhance sealing performance. Optionally, the third seal can be compressed by 50% to achieve better sealing performance. For example, the thickness of the third seal can be 3 mm to 4 mm. After installing the third fastener 430, the thickness of the third seal is compressed to 1.5 mm to 2 mm.

[0053] Illustratively, a maintenance opening is provided on the front sidewall of the first housing 210, placing the maintenance cover 240 close to components mounted on the first housing 210, facilitating routine maintenance of the components. Optionally, the first housing 210 is provided with a plurality of third mounting holes around the periphery of the maintenance opening, wherein third rivet nuts are mounted in the third mounting holes. The third fastener 430 is a fastening bolt that sequentially passes through the maintenance cover 240 and the third seal to engage with the third rivet nuts in the third mounting holes.

[0054] The battery pack assembly method in the embodiment of the present application may include the following steps.

[0055] Pre-install components such as the first main positive copper plate 611, the main positive connector 612, the first main negative copper plate 621, the main negative connector 622, the BMU 631, the BMU communication connector 632, the BMU internal communication harness 633, the PACK internal fire detector 641, the fire nozzle 642, the fire communication connector 643, the fuse 650, the MSD 661, the connecting copper plate 662, and the explosion-proof valve 670 on the first housing 210. Connect the first main positive copper plate 611 to the main positive connector 612, and the first main negative copper plate 621 to the main negative connector 622. Pre-install the maintenance cover 240 on the first housing 210.

[0056] Apply thermally conductive structural adhesive to the cooling plate 100, hoist the battery module 700 onto the cooling plate 100, and secure it to the cooling plate 100 with bolts. Attach the first seal 510 to the cooling plate 100, and place the first housing 210 on top of it. Pass the first fastener 410 from top to bottom through the first connection portion 220 and the first seal 510 to engage with the first rivet nut on the cooling plate 100, achieving a sealed installation between the cooling plate 100 and the first housing 210, meeting IP67 and higher protection requirements. Connect the second main positive copper plate of the battery module 700 to the first main positive copper plate 611, and the second main negative copper plate to the first main negative copper plate 621.

[0057] The second sealing member 520 is attached to the second connecting portion 230, and the second shell 300 is placed on the second sealing member 520. The second fastener 420 passes through the second shell 300 and the second sealing member 520 from top to bottom to cooperate with the second rivet nut on the second connecting portion 230 to achieve sealed installation of the first shell 210 and the second shell 300, which can meet protection requirements above IP67.

[0058] Other structures and operations of the battery pack according to the embodiment of the first aspect of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0059] A second aspect of the present application provides an energy storage device, which includes a battery pack according to the first aspect of the present application.

[0060] Other structures and operations of the energy storage device according to the embodiment of the second aspect of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0061] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A battery pack, characterized in that: include: A first shell, a second shell, and a liquid cooling plate enclosed to form a receiving cavity, wherein the receiving cavity is used to receive the battery module; a first fastener, the first housing being connected to the liquid cooling plate via the first fastener; A second fastener, the second shell is connected to the first shell through the second fastener, and the second fastener is parallel to the first fastener.

2. The battery pack according to claim 1, wherein: The first shell is provided with a first connecting portion and a second connecting portion. The first fastener is passed through the first connecting portion to be connected to the liquid cooling plate. The second fastener is passed through the second shell to be connected to the second connecting portion.

3. The battery pack according to claim 2, wherein: The first connecting portion is arranged at one end of the first shell close to the liquid cooling plate, and the second connecting portion is arranged at one end of the first shell close to the second shell, and both the first connecting portion and the second connecting portion are flanges, and the flanges are turned outward relative to the side wall of the first shell.

4. The battery pack according to claim 1, wherein: A first sealing member is provided between the first shell and the liquid cooling plate, and a second sealing member is provided between the first shell and the second shell.

5. The battery pack according to claim 1, wherein: The battery pack further includes components, which are mounted on the first shell.

6. The battery pack according to claim 5, wherein: The components include a first total positive copper plate, a total positive connector, a first total negative copper plate and a total negative connector. The first total positive copper plate is connected to the total positive connector, and the first total negative copper plate is connected to the total negative connector.

7. The battery pack according to claim 6, wherein: The battery module includes a second total positive copper plate and a second total negative copper plate, the distance between the second total positive copper plate and the second total negative copper plate is greater than 500 mm, the second total positive copper plate is connected to the first total positive copper plate, and the second total negative copper plate is connected to the first total negative copper plate.

8. The battery pack according to claim 1, wherein: The battery pack further includes a maintenance cover. The first shell is provided with a maintenance opening. The maintenance cover is installed at the maintenance opening of the first shell to shield the maintenance opening.

9. The battery pack according to claim 8, wherein: A third sealing member is provided between the maintenance cover and the first shell.

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

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