New energy battery pack shell and battery pack

Abstract

The utility model provides a new energy battery pack shell and a battery pack, and belongs to the technical field of new energy batteries. The new energy battery pack shell comprises a lower box body bottom plate, a module end plate, a module partition plate and a module cover plate. Wherein a first liquid cooling flow channel is arranged in a bottom plate of the lower box body, the number of the module end plates is two, a second liquid cooling flow channel communicated with the first liquid cooling flow channel is arranged in each module end plate, and a third liquid cooling flow channel which is arranged in a coiled mode and communicated with the first liquid cooling flow channel is arranged in the edge of the module partition plate. The module cover plate is fixedly arranged above the module end plate and the module partition plate in a covering mode, and a foam layer is arranged on the side face, close to the bottom plate of the lower box body, of the module cover plate. The new energy battery pack shell is adopted to form the battery pack, the defects in the prior art can be overcome, the safety performance of the battery pack structure is improved, and the service life of the battery pack structure is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a new energy battery pack shell and a battery pack. Background Art

[0002] With the rapid development of electric vehicles, their research and application are gaining increasing attention. Lithium batteries and other new energy batteries, as the power source of electric vehicles, are a crucial component. CTP (Cell to Pack) is a new energy battery structure that integrates the battery cell directly into the battery pack housing, eliminating the intermediate module structure, simplifying the battery pack structure, and improving the pack's space utilization.

[0003] In related technologies, to suppress temperature rise during charging and discharging of stacked battery cells, a liquid cooling plate is typically installed at the bottom of the module to achieve heat exchange and temperature uniformity. In conventional CTP (Computed Toy Story) cell modules, thermally conductive adhesive is typically applied to secure individual cells to the underlying liquid cooling plate.

[0004] The CTP cell module format used in related technologies uses heat exchange and cooling solely at the bottom of the cell, resulting in a limited heat exchange area. This also leads to low heat exchange and temperature uniformity within the module, resulting in poor heat dissipation. Furthermore, new energy vehicles experience varying degrees of turbulence during driving, depending on road conditions. The module structure within the battery pack can also vibrate and be damaged due to insufficient rigidity in the fixed structure. These defects can shorten the service life of new energy batteries. Utility Model Content

[0005] The present invention provides a new energy battery pack housing and battery pack that can overcome the shortcomings of the prior art and improve the safety performance and service life of the battery pack structure. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present invention provides a new energy battery pack housing, comprising:

[0007] The lower box bottom plate is provided with a first liquid cooling channel.

[0008] Module end plates, two of which are arranged parallel to each other along a first direction on the bottom plate of the lower box body, and each of which is provided with a second liquid-cooling channel arranged in a coiled manner, wherein the inlet and outlet of the second liquid-cooling channel are both connected to the first liquid-cooling channel;

[0009] a module partition plate, the module partition plate being arranged along the first direction, the module partition plate being provided with a third liquid cooling channel arranged in a coiled manner, the inlet and outlet of the third liquid cooling channel both being in communication with the first liquid cooling channel;

[0010] A module cover plate, wherein the module cover plate fixed cover is arranged above the module end plate and the module partition plate, and a foam layer is provided on a side of the module cover plate close to the bottom plate of the lower box body.

[0011] Optionally, a pressing protrusion is protruding from a side surface of the module cover close to the bottom plate of the lower box body.

[0012] Optionally, a plurality of module partition plates are provided, and the plurality of module partition plates are arranged in parallel and at intervals along a second direction perpendicular to the first direction.

[0013] Optionally, both ends of the module partition plate are respectively connected to the two module end plates.

[0014] Optionally, the top end surfaces of the module end plates are each provided with a first bolt hole, and the module cover plate is provided with a second bolt hole matching the first bolt hole.

[0015] Optionally, it also includes an upper box cover plate, which includes a top plate and multiple side plates arranged around the top plate, the upper box cover plate is fixedly covered on the lower box bottom plate, the top plate abuts against a side of the module cover plate away from the lower box bottom plate, the multiple side plates are arranged around the module end plate and the module partition plate, and a third bolt hole matching the second bolt hole is provided on the top plate.

[0016] Optionally, a sealing foam layer is provided on a side surface of the top plate away from the bottom plate of the lower box body.

[0017] Optionally, a weight-reducing opening is provided on the top plate.

[0018] In the second aspect, an embodiment of the present invention further provides a battery pack, comprising the battery pack shell described in the first aspect, and also comprising a battery cell module, wherein the battery cell module comprises a plurality of single battery cells stacked along the first direction, and the battery cell module is fixedly mounted on the bottom plate of the lower box body by means of thermally conductive structural adhesive, and the two ends are respectively abutted against the two module end plates, and the side of the battery cell module in the first direction is fixedly connected to the module partition plate by means of thermally conductive structural adhesive.

[0019] Optionally, the foam layer is provided between adjacent single battery cells and between the single battery cells and the module end plate.

[0020] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0021] The new energy battery pack shell provided by the embodiment of the present invention utilizes the lower box bottom plate to support the battery module, and the battery module is limited and fixed in the horizontal direction by the module end plate and the module partition plate, and is bonded in multiple directions by applying thermal conductive structural adhesive on the lower box bottom plate and the module partition plate, and is fixed on the top by the module cover plate, and is fully contacted by the foam layer. The multi-directional limit fixation of the upper, lower and side surfaces of the battery module ensures the compactness and stability of the overall structure, and improves the vibration resistance during operation. At the same time, the module end plate and the module partition plate are respectively provided with a second liquid cooling channel and a third liquid cooling channel that are connected to the first liquid cooling channel in the lower box bottom plate. While the external coolant is introduced through the first liquid cooling channel for liquid cooling circulation, the coolant will also flow through the module end plate and the module partition plate at the same time, and heat exchange and temperature uniformity are carried out simultaneously in multiple directions of the battery module, thereby overcoming the defects of the prior art and improving the safety performance and service life of the battery pack structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the new energy battery pack housing provided by an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the assembly structure of the battery cell module in the shell of the new energy battery pack provided by an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the assembly structure of the foam layer and the battery core module provided by an embodiment of the present utility model;

[0026] Figure 4 This is a schematic structural diagram of a module end plate provided by an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the internal structure of the module end plate provided in an embodiment of the present utility model;

[0028] Figure 6 This is a schematic structural diagram of a module partition plate provided by an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the internal structure of the module partition plate provided in an embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of the top structure of the module cover provided by an embodiment of the present utility model;

[0031] Figure 9 This is a schematic diagram of the bottom structure of the module cover provided by an embodiment of the present utility model;

[0032] Figure 10 This is a schematic structural diagram of the sealing foam layer provided by an embodiment of the present utility model;

[0033] Figure 11 It is a structural schematic diagram of a battery pack provided by an embodiment of the present utility model.

[0034] In the figure: 1-lower box bottom plate; 2-module end plate; 3-module partition plate; 4-module cover plate; 5-upper box cover plate; 6-sealing foam layer; 7-battery cell module; 11-first liquid-cooling channel; 21-second liquid-cooling channel; 31-third liquid-cooling channel; 41-pressing protrusion; 51-top plate; 52-side plate; 71-single battery cell; 511-weight reduction opening; a-foam layer; b-first bolt hole; c-second bolt hole; d-third bolt hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the three-dimensional structure of the new energy battery pack housing provided by an embodiment of the present utility model; Figure 2 This is a schematic diagram of the assembly structure of the battery cell module in the shell of the new energy battery pack provided by an embodiment of the present utility model; Figure 3 This is a schematic diagram of the assembly structure of the foam layer and the battery core module provided by an embodiment of the present utility model; Figure 4 This is a schematic structural diagram of a module end plate provided by an embodiment of the present utility model; Figure 5 This is a schematic diagram of the internal structure of the module end plate provided in an embodiment of the present utility model; Figure 6 This is a schematic diagram of the structure of the module partition plate provided by the embodiment of the utility model Figure 7 This is a schematic diagram of the internal structure of the module partition plate provided in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the top structure of the module cover provided by an embodiment of the present utility model; Figure 9 This is a schematic diagram of the bottom structure of the module cover provided by an embodiment of the present utility model; Figure 10 This is a schematic diagram of the structure of the sealing foam layer provided by the embodiment of the utility model. Figures 1 to 10 As shown, an embodiment of the present invention provides a new energy battery pack housing, comprising a lower box bottom plate 1, a module end plate 2, a module partition plate 3 and a module cover plate 4.

[0037] Among them, a first liquid-cooling channel 11 is provided in the lower box bottom plate 1. Two module end plates 2 are provided and arranged parallel and spaced apart along the first direction on the lower box bottom plate 1. A second liquid-cooling channel 21 arranged in a coiled manner is provided in the module end plate 2, and the inlet and outlet of the second liquid-cooling channel 21 are both connected to the first liquid-cooling channel 11. The module partition plate 3 is arranged along the first direction. A third liquid-cooling channel 31 arranged in a coiled manner is provided in the module partition plate 3, and the inlet and outlet of the third liquid-cooling channel 31 are both connected to the first liquid-cooling channel 11. The module cover plate 4 is fixedly provided above the module end plate 2 and the module partition plate 3, and a foam layer a is provided on the side of the module cover plate 4 close to the lower box bottom plate 1.

[0038] In an embodiment of the present utility model, the new energy battery pack shell is used to accommodate the battery module 7, and the battery module 7 includes a plurality of single battery cells 71 stacked along a first direction. During assembly, first apply thermal conductive structural adhesive on the lower box bottom plate 1, and arrange the single battery cells 71 in sequence along the first direction and place them between the two module end plates 2 and fix them on the thermal conductive structural adhesive. The two module end plates 2 are used to limit and fix them in the stacking direction to form a CTP structure. At the same time, the side of the battery module 7 in the stacking direction is fitted with the module partition plate 3, and is filled with thermal conductive structural adhesive for fixed connection to achieve lateral support for the battery module 7. Finally, the module cover plate 4 is fixedly placed above the module end plate 2 and the module partition plate 3 and covers the battery module 7 below. The foam layer a provided on one side close to the lower box bottom plate 1 is used to contact the top of the battery module 7 to complete the fixed assembly.

[0039] The new energy battery pack shell provided by the embodiment of the present invention is adopted, and the lower box bottom plate 1 is used to support the battery cell module 7, and the battery cell module 7 is limited and fixed in the horizontal direction by the module end plate 2 and the module partition plate 3. The lower box bottom plate 1 and the module partition plate 3 are coated with thermal conductive structural adhesive for multi-directional bonding, and the top is fixed by the module cover plate 4, and the foam layer a is used for full contact. The multi-directional limiting and fixing of the battery cell module 7 on the upper, lower and side surfaces ensures the compactness and stability of the overall structure, and improves the vibration resistance during operation. At the same time, the module end plate 2 and the module partition plate 3 are respectively provided with a second liquid cooling channel 21 and a third liquid cooling channel 31 which are connected to the first liquid cooling channel 11 in the lower box bottom plate 1. While the external coolant is introduced through the first liquid cooling channel 11 for liquid cooling circulation, the coolant will also flow through the module end plate 2 and the module partition plate 3 at the same time, and follow the coolant in the first liquid cooling channel 11 through the inlet and outlet to circulate in and out, and heat exchange and temperature equalization are carried out simultaneously in multiple directions of the battery cell module 7, thereby overcoming the defects of the existing technology and improving the safety performance and service life of the battery pack structure.

[0040] Optionally, a pressing protrusion 41 is provided on one side of the module cover 4 near the lower box bottom plate 1. For example, in the embodiment of the present utility model, by die-casting the pressing protrusion 41 on the bottom surface of the module cover 4, when the cover is closed over the battery module 7, the pressing protrusion 41 presses down the foam layer a below, thereby closely contacting the top of the battery module 7 to achieve pressing and fixing, thereby improving the overall assembly stability, avoiding longitudinal shaking, and improving vibration resistance.

[0041] Optionally, a plurality of module partition plates 3 are provided, and the plurality of module partition plates 3 are arranged in parallel and spaced apart along a second direction perpendicular to the first direction. For example, in an embodiment of the present utility model, two module partition plates 3 are provided, that is, the lower box bottom plate 1 can be used to support and install four groups of battery modules 7, and a module partition plate 3 is used between every two groups of battery modules 7 for separation and laterally support. In other possible implementation methods, more module partition plates 3 can also be provided according to the actual specifications of the battery pack, and the present utility model does not limit this. Furthermore, the two ends of the module partition plate 3 are respectively connected to the two module end plates 2. The module partition plate 3 not only plays the role of isolation support and lateral heat exchange for the battery module 7, but its two ends in the extension direction are also fixedly connected to the module end plates 2 to form a frame structure, thereby improving the overall structural stability, rigidity and vibration resistance.

[0042] For example, in the embodiment of the present invention, the lower box bottom plate 1, the module end plate 2 and the module partition plate 3 are all made of AL6061 aluminum material with high thermal conductivity, which effectively ensures heat dissipation efficiency.

[0043] Optionally, the top end surfaces of the module end plates 2 are each provided with first bolt holes b, and the module cover plate 4 is provided with second bolt holes c that match the first bolt holes b. For example, in an embodiment of the present utility model, the edge of the module cover plate 4 is provided with a circle of second bolt holes c that correspond to the first bolt holes b on the module end plate 2. After the cover is placed over the second bolt holes c corresponding to the first bolt holes b, the module cover plate 4 is fixedly connected by bolts through the second bolt holes c corresponding to the first bolt holes b, thereby completing the fixed installation of the module cover plate 4. This has a simple structure and is easy to install.

[0044] Optionally, it also includes an upper box cover 5, which includes a top plate 51 and multiple side plates 52 arranged around the top plate 51. The upper box cover 5 is fixedly covered on the lower box bottom plate 1. The top plate 51 abuts against a side of the module cover 4 away from the lower box bottom plate 1. Multiple side plates 52 are arranged around the module end plate 2 and the module partition plate 3. A third bolt hole d matching the second bolt hole c is provided on the top plate 51. For example, in an embodiment of the present invention, in addition to using the module cover 4 to cover and press the top of the battery cell module 7, after completing the connection of the module cover 4, the module end plate 2, the module partition plate 3, and the battery cell module 7 arranged between the module end plate 2 and the module partition plate 3, as well as the top module cover 4 can also be covered from top to bottom by the upper box cover 5, wherein the top plate 51 further presses and fixes the module cover 4 from the top, and multiple side plates 52 surround the above structure as a whole from the side to form a battery pack structure. Among them, a circle of third bolt holes d matching the second bolt holes c is provided on the edge of the top plate 51, and second bolt holes c are additionally provided on both side surfaces of the module cover plate 4. When performing the overall assembly, the module cover plate 4 and the upper box cover plate 5 can be assembled in sequence, and the corresponding first bolt holes b, second bolt holes c and third bolt holes d can be made coaxial, and then bolts can be inserted to achieve an integrated fixed connection. The structure is simple, the assembly is convenient, and the integrity is better.

[0045] Optionally, a sealing foam layer 6 is provided on the side of the top plate 51 facing away from the lower box bottom plate 1. For example, a layer of sealing foam layer 6 is applied between the top plate 51 and the module cover 4, particularly at the bolted connection point. This improves the seal between the inner and outer layers of the battery pack housing, preventing external dust and impurities from entering and affecting the normal operation of the battery cell module 7. The sealing foam layer 6 also provides a certain degree of vibration resistance and improves assembly stability.

[0046] Optionally, a weight-reducing opening 511 is provided on the top plate 51. For example, in an embodiment of the present invention, a weight-reducing opening 511 is provided in the middle of the top plate 51, where no bolt connection is required. Since the lower layer has a module cover 4 to cover the upper portion of the battery module 7, and the edges are surrounded by multiple side plates 52 and a plate body with surrounding third bolt holes d, the middle portion of the top plate 51 can be hollowed out, thereby reducing the overall weight of the battery pack shell while ensuring sealing and overall rigidity, lowering production costs and improving practicality.

[0047] Figure 11 This is a schematic diagram of the structure of the battery pack provided by the embodiment of the present utility model. Figure 11 As shown, the embodiment of the present invention also provides a battery pack, including Figures 1 to 10The new energy battery pack shell shown also includes a cell module 7, which includes a plurality of single cells 71 stacked along a first direction. The cell module 7 is fixedly mounted on the lower box bottom plate 1 by thermally conductive structural adhesive, and its two ends are respectively abutted against the two module end plates 2. The side of the cell module 7 in the first direction is fixedly connected to the module partition plate 3 by thermally conductive structural adhesive. The new energy battery shell provided by the embodiment of the utility model is used to accommodate the cell module 7. The cell module 7 is supported by the lower box bottom plate 1, and the cell module 7 is fixed in a horizontal direction by the module end plates 2 and the module partition plate 3. The cell module 7 is multi-directionally bonded by applying thermally conductive structural adhesive on the lower box bottom plate 1 and the module partition plate 3. The top is fixed by the module cover plate 4, and is fully contacted by the foam layer a. The multi-directional fixed upper, lower, and side surfaces of the cell module 7 ensure the compactness and stability of the overall structure and improve the vibration resistance during operation. At the same time, the module end plate 2 and the module partition plate 3 are respectively provided with a second liquid cooling channel 21 and a third liquid cooling channel 31 which are connected to the first liquid cooling channel 11 in the lower box bottom plate 1. While the external coolant is introduced through the first liquid cooling channel 11 for liquid cooling circulation, the coolant will also flow through the module end plate 2 and the module partition plate 3 at the same time, and follow the coolant in the first liquid cooling channel 11 through the inlet and outlet to circulate in and out, and heat exchange and temperature equalization are carried out simultaneously in multiple directions of the battery cell module 7, thereby overcoming the defects of the existing technology and improving the safety performance and service life of the battery pack structure.

[0048] Optionally, a foam layer a is provided between adjacent single cells 71, and between a single cell 71 and the module end plate 2. For example, in an embodiment of the present invention, a foam layer a for heat insulation and vibration resistance is provided between adjacent single cells 71, and between a single cell 71 and the module end plate 2, further improving the safety performance and service life of the battery pack structure.

[0049] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present invention belongs. The terms "first", "second" and similar words used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, 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 new energy battery pack housing, characterized in that: include: A lower box bottom plate (1), wherein a first liquid cooling channel (11) is provided in the lower box bottom plate (1), Module end plates (2), two of the module end plates (2) are arranged parallel to each other along a first direction on the bottom plate (1) of the lower box body, and a second liquid cooling channel (21) arranged in a coiled manner is provided in the module end plates (2), and both the inlet and the outlet of the second liquid cooling channel (21) are in communication with the first liquid cooling channel (11); A module partition plate (3), the module partition plate (3) being arranged along the first direction, a third liquid cooling channel (31) being arranged in a coiled manner being provided in the module partition plate (3), an inlet and an outlet of the third liquid cooling channel (31) both being in communication with the first liquid cooling channel (11); A module cover plate (4) is fixedly provided above the module end plate (2) and the module partition plate (3), and a foam layer (a) is provided on a side of the module cover plate (4) close to the lower box bottom plate (1).

2. A new energy battery pack housing according to claim 1, characterized in that: A pressing protrusion (41) is protruding from a side surface of the module cover plate (4) close to the lower box bottom plate (1).

3. The new energy battery pack housing according to claim 1, characterized in that: A plurality of the module partition plates (3) are provided, and the plurality of module partition plates (3) are arranged in parallel and at intervals along a second direction perpendicular to the first direction.

4. A new energy battery pack housing according to claim 3, characterized in that: Both ends of the module partition plate (3) are respectively connected to the two module end plates (2).

5. The new energy battery pack housing according to claim 1, characterized in that: The top end surface of the module end plate (2) is provided with a first bolt hole (b), and the module cover plate (4) is provided with a second bolt hole (c) matching the first bolt hole (b).

6. The new energy battery pack housing according to claim 5, characterized in that: The invention also includes an upper box cover (5), wherein the upper box cover (5) includes a top plate (51) and a plurality of side plates (52) arranged around the top plate (51), the upper box cover (5) is fixedly mounted on the lower box bottom plate (1), the top plate (51) abuts against a side of the module cover (4) away from the lower box bottom plate (1), the plurality of side plates (52) are arranged around the module end plate (2) and the module partition plate (3), and a third bolt hole (d) matching the second bolt hole (c) is provided on the top plate (51).

7. The new energy battery pack housing according to claim 6, characterized in that: A sealing foam layer (6) is provided on one side of the top plate (51) away from the lower box bottom plate (1).

8. The new energy battery pack housing according to claim 6, characterized in that: A weight-reducing opening (511) is provided on the top plate (51).

9. A battery pack, comprising the new energy battery pack housing according to any one of claims 1 to 8, characterized in that: The battery module (7) further comprises a battery cell module (7), wherein the battery cell module (7) comprises a plurality of single battery cells (71) stacked and arranged along the first direction, the battery cell module (7) being fixedly mounted on the bottom plate (1) of the lower box body by means of a heat-conducting structural adhesive, and having two ends respectively abutting against the two module end plates (2), and the side of the battery cell module (7) in the first direction being fixedly connected to the module partition plate (3) by means of a heat-conducting structural adhesive.

10. The battery pack according to claim 9, characterized in that: The foam layer (a) is provided between adjacent single battery cells (71) and between the single battery cells (71) and the module end plate (2).

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