Power battery module and battery pack

Abstract

The utility model discloses a power battery module which comprises a plurality of battery row modules arranged in parallel, each battery row module is provided with a plurality of battery cell units, the plurality of battery cell units are uniformly arranged along a first direction A, and the first direction A is an arrangement direction B perpendicular to the plurality of battery row modules; the foaming colloid piece is arranged between two adjacent battery cell units, and each battery cell unit is coated with the foaming colloid piece; the module fixing frame is arranged in an extending mode in the central axis direction C of the battery cell units, the module fixing frame is fixedly connected to the battery row module, and the foaming colloid pieces are matched with the module fixing frame so as to fix the battery cell units from the peripheral side faces of the battery cell units. Besides, the utility model also discloses a battery pack applying the power battery module, and the height size of the existing cylindrical power battery module is reduced on the premise of ensuring the stable assembly of each battery cell unit.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a power battery module and a battery pack. Background Art

[0002] In existing battery packs, the cells of cylindrical power battery modules are usually placed vertically, and the corresponding installation and fixing structure is in the form of a tray, that is, the existing tray is used to install and fix the cells. Since the tray itself will occupy a certain space, when the cylindrical power battery module is equipped with a pressure relief system, the overall height of the cylindrical power battery module includes the first height dimension of the tray, the cell height along the central axis direction, and the second height dimension of the pressure relief system, making the overall height of the battery pack relatively high. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art described above, the utility model provides a power battery module and a battery pack, which reduce the height size of the existing cylindrical power battery module while ensuring the stable assembly of each battery cell unit.

[0004] The technical solution adopted by the utility model to solve the problem is:

[0005] A power battery module, comprising:

[0006] A plurality of battery row modules arranged in parallel, each of the battery row modules having a plurality of battery cell units, the plurality of battery cell units being evenly arranged along a first direction A, the first direction A being perpendicular to an arrangement direction B of the plurality of battery row modules;

[0007] A foam colloid member, wherein the foam colloid member is disposed between two adjacent battery core units, and the foam colloid member covers each of the battery core units;

[0008] The module fixing frame is extended along the central axis direction C of the battery cell unit, the module fixing frame is fixedly connected to the battery row module, and the foam colloid part cooperates with the module fixing frame to fix the battery cell unit from the peripheral side of the battery cell unit.

[0009] In some embodiments of the present invention, the module fixing frame includes a fixing frame body and an external connection portion provided on the fixing frame body, the external connection portion is used to fix the connection box to the counterpart, and the fixing frame body is bonded to the battery row module.

[0010] In some embodiments of the present invention, the fixing frame body is extended along an arrangement direction B of the plurality of battery row modules.

[0011] In some embodiments of the present invention, the fixing frame body includes a transition portion and a force-bearing portion extending along the first direction A, the transition portion extends from the force-bearing portion toward the outer connecting portion, and the transition portion is connected to the outer connecting portion.

[0012] In some embodiments of the present invention, a battery cell avoidance groove is provided on the fixing frame body, and the battery cell avoidance groove is adapted to the battery cell unit.

[0013] In some embodiments of the present invention, at least one reinforcing rib is disposed between the fixing frame body and the outer connecting portion.

[0014] In some embodiments of the present invention, a plurality of the battery row modules are arranged in parallel to form a battery pack, and the module fixing frames are disposed on two opposite sides of the battery pack.

[0015] In some embodiments of the utility model, the power battery module also includes a pressure relief and heat dissipation component, each of the battery cell units of the battery row module is arranged on the pressure relief and heat dissipation component along the axis C thereof, and the battery cell explosion-proof valve of any battery cell unit can be opened in a thermal runaway state, so that the corresponding battery cell unit is connected to the pressure relief chamber of the pressure relief and heat dissipation component.

[0016] In some embodiments of the utility model, the pressure relief and heat dissipation component includes a plastic bracket and a bracket cover covering the plastic bracket, the plastic bracket cooperates with the bracket cover to form the pressure relief chamber, and the plastic bracket is provided with a pressure relief part corresponding to each of the battery cell units.

[0017] The utility model also discloses a battery pack, comprising the above-mentioned power battery module.

[0018] In summary, the power battery module and battery pack provided by the utility model have the following technical effects:

[0019] Through the cooperation between the foam colloid part and the module fixing frame, each battery cell unit of the battery row module can be constrained in its radial direction, thereby replacing the existing tray installation and fixing method, and reducing the height dimension of the existing cylindrical power battery module while ensuring the stable assembly of each battery cell unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall exploded structural diagram of a power battery module of the utility model;

[0021] Figure 2 This is a first structural diagram of a first embodiment of a power battery module of the utility model;

[0022] Figure 3This is a second structural diagram of a first embodiment of a power battery module of the utility model;

[0023] Figure 4 This is a first assembly top view of a power battery module of the utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross section at AA in FIG.

[0025] Figure 6 for Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0026] Figure 7 A second structural diagram of a second embodiment of a power battery module of the utility model;

[0027] Figure 8 This is a second assembly top view of a power battery module of the utility model;

[0028] Fig. 9 for Figure 8 Schematic cross-sectional view at CC in FIG.

[0029] Fig.10 for Fig. 9 A local enlarged schematic diagram of point D in the middle.

[0030] Icons: 1-battery pack, 11-battery cell unit, 2-foam colloid part, 3-module fixing frame, 31-fixing frame body, 311-transition part, 312-force-bearing part, 32-external connection part, 33-battery cell avoidance groove, 34-reinforcement rib, 35-installation hole, 4-pressure relief and heat dissipation part, 41-plastic bracket, 42-bracket outer cover, 43-pressure relief pipe fitting, 5-structural adhesive layer. DETAILED DESCRIPTION

[0031] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] First embodiment

[0035] The utility model discloses a battery pack, which includes a box pair and a power battery module, wherein the power battery module is installed inside the box pair. The box pair is a relatively mature prior art in the field, and this solution does not make significant improvements to the box pair. Therefore, this solution does not elaborate on and display the box pair.

[0036] The core solution of this embodiment is to combine Figures 1 to 6 As shown, the above-mentioned power battery module includes a foam colloid member 2, a module fixing frame 3 and a plurality of battery row modules arranged in parallel, wherein each battery row module has a plurality of battery cell units 11, and the plurality of battery cell units 11 are evenly arranged along a first direction A, and the first direction A is perpendicular to the arrangement direction B of the plurality of battery row modules.

[0037] It can be understood that the battery cell unit 11 is preferably a cylindrical battery, and the battery cell unit 11 is defined to have a relatively arranged battery cell positive terminal and a battery cell negative terminal. The battery cell explosion-proof valve of the battery cell unit 11 can be optionally located near the battery cell positive terminal of the battery cell unit 11, and in other designs, the battery cell explosion-proof valve of the battery cell unit 11 can also be optionally located at the battery cell negative terminal of the battery cell unit 11. Several battery cell units 11 are connected in series and parallel through conductive rows. In addition, the battery cell positive terminals of each battery cell unit 11 in the battery row module are located on the same side, and the battery cell positive terminals of the battery cell units 11 of two adjacent battery row modules are preferably staggered.

[0038] In this embodiment, please refer to Figure 5 and Figure 6 As shown, the foamed colloid member 2 is disposed between two adjacent battery cells 11, and the foamed colloid member 2 covers each battery cell 11. Specifically, the foamed colloid member 2 covers the surrounding side of the battery cell 11 and the battery cell explosion-proof valve of the battery cell 11. The foamed colloid member 2 here belongs to polyurethane or silicone glue, which is not specifically limited here. In this way, the battery cell 11 is completely wrapped with the foamed colloid member 2. Not only can the foamed colloid member 2 have good flame retardant and heat-insulating capabilities, but also the heat, material, flame, etc. after thermal runaway of any battery cell 11 can be prevented from being transferred to the adjacent battery cell 11. At the same time, under the action of the foamed colloid member 2, several battery cells 11 can be compactly combined and connected together.

[0039] For further details, please refer to Figure 1 , Figure 5 and Figure 6 As shown, the above-mentioned module fixing frame 3 is extended along the central axis direction C of the battery cell unit 11, the module fixing frame 3 is fixedly connected to the battery row module, and the foam colloid member 2 cooperates with the module fixing frame 3 to fix the battery cell unit 11 from the side surface of the battery cell unit 11, that is, the foam colloid member 2 cooperates with the module fixing frame 3 to act on the side surface of the battery cell unit 11, so that each battery cell unit 11 can form constraints in the radial direction and the central axis direction C, thereby achieving the purpose of fixing each battery cell unit 11.

[0040] It should be noted that the central axis direction C here is also the height direction of the battery cell unit 11 .

[0041] Specifically, the module fixing frame 3 acts on the peripheral side of the battery cell unit 11 in the battery row module, directly restricting the radial movement of each battery cell unit 11. When the module fixing frame 3 is fixed to the box body, it can stably restrict a number of battery row modules, so that the battery row modules remain stationary. At the same time, the foamed colloid member 2 adheres to the peripheral side of the battery cell unit 11, and the module fixing frame 3 is fixedly connected to the battery row module, which can also directly restrict the movement of each battery cell unit 11 in the central axis direction C.

[0042] As a preferred solution of this embodiment, please refer to Figures 1 to 6 As shown, the module fixing frame 3 includes a fixing frame body 31 and an outer connecting portion 32 disposed on the fixing frame body 31, and the fixing frame body 31 is bonded to the battery row module. The side of the fixing frame body 31 used to approach and act on the battery row module is defined as the inner side of the fixing frame body 31, and the side of the fixing frame body 31 used to be away from the battery row module is defined as the outer side of the fixing frame body 31.

[0043] Specifically, the inner side surface of the frame body 31 is coated with a structural adhesive layer 5, and other types of colloids can be selected here according to the structural design and design requirements. Of course, the structural adhesive layer 5 can be coated on part of the inner side surface of the frame, or it can be selected to coat the entire inner side surface of the frame. By utilizing the viscosity of the structural adhesive layer 5, the battery cell unit 11 close to the frame body 31 in the battery row module can be bonded and connected to the frame body 31.

[0044] Please refer to the following for details: Figures 2 to 6As shown, a cell avoidance groove 33 is provided on the fixing frame body 31, and the shape and size of the cell avoidance groove 33 are preferably adapted to the shape and size of the cell unit 11. The inner wall of the cell avoidance groove 33 is coated with a structural adhesive layer 5, and the cell unit 11 is correspondingly embedded in the inner part of the cell avoidance groove 33, which not only firmly limits the cell unit 11, but also limits the cell unit 11 in the radial direction, so that the movement of several battery row modules in the first direction A and the arrangement direction B can be stably constrained. In addition, the peripheral side surface of the cell unit 11 is bonded to the inner wall of the cell avoidance groove 33 through the structural adhesive layer 5, so that the cell unit 11 of the battery row module will not be separated from the cell avoidance groove 33 of the fixing frame body 31.

[0045] It can be understood that the battery cell unit 11 near the fixing frame body 31 in the battery row module is preferably partially covered by the foam colloid member 2, and the portion of the battery cell unit 11 that is not covered by the foam colloid member 2 is bonded and connected by the structural adhesive layer 5. Of course, the battery cell unit 11 near the fixing frame body 31 in the battery row module can also be completely covered by the foam colloid member 2, and the foam colloid member 2 and the structural adhesive layer 5 are bonded and connected.

[0046] During the installation process, the molded structural adhesive layer 5 is first coated in the battery cell avoidance groove 33 of the fixing frame body 31, and the module fixing frame 3 is bonded and connected to the several battery row modules through the structural adhesive layer 5. Then, the molded foamed colloid part 2 is injected between the several battery row modules to achieve a reliable connection between the module fixing frame 3 and the several battery row modules.

[0047] As one of the preferred solutions, please refer to Figure 2 , Figure 3 and Figure 6 As shown, the fixing frame body 31 is extended along the arrangement direction B of the plurality of battery row modules, that is, the first direction A of each battery row module is perpendicular to the inner side of the fixing frame body 31. In addition, each fixing frame body 31 is bonded to the battery row module, so that, in conjunction with the foam colloid member 2, each battery cell unit 11 can be firmly installed and fixed on the box counterpart.

[0048] For further details, please refer to Figure 1 and Figure 4 As shown, a plurality of battery row modules are arranged in parallel to form a battery pack 1, and module fixing frames 3 are provided on two opposite sides of the battery pack 1. Specifically, two module fixing frames 3 are arranged in the first direction A of the battery pack 1, and the two module fixing frames 3 are respectively provided on two opposite sides of the battery pack 1, so that the power battery module can be more stably assembled on the box counterpart, and the battery pack will not become loose due to vibration or shaking during use.

[0049] As a further preferred solution of this embodiment, please refer to Figure 2 As shown, at least one reinforcing rib 34 is disposed between the fixing frame body 31 and the outer connecting portion 32 to enhance the overall structural strength of the module fixing frame 3, thereby improving the overall firmness and stability of the power battery module and the battery pack.

[0050] Preferably, the power battery module further includes a pressure relief and heat removal component 4, and each battery cell unit 11 of the battery row module is arranged on the pressure relief and heat removal component 4 along the central axis direction C, that is, the pressure relief and heat removal component 4 covers each battery cell unit 11 in the orthographic projection direction, and the battery cell explosion-proof valve of any battery cell unit 11 can be opened in the thermal runaway state, so that the corresponding battery cell unit 11 is connected to the pressure relief chamber of the pressure relief and heat removal component 4. In this way, when any battery cell unit 11 has thermal runaway, it can be ensured that the high-temperature and high-pressure ejected matter released by the battery cell unit 11 impacts the pressure relief chamber of the pressure relief and heat removal component 4.

[0051] As a preferred solution of this embodiment, please refer to Figure 1 As shown, the pressure relief and heat dissipation component 4 includes a plastic bracket 41 and a bracket outer cover 42 covering the plastic bracket 41 . The plastic bracket 41 cooperates with the bracket outer cover 42 to form the above-mentioned pressure relief chamber. The plastic bracket 41 is provided with a pressure relief portion corresponding to each battery cell unit 11 .

[0052] Specifically, the pressure relief portion can be selected as an exhaust hole or a weak portion. The foam colloid member 2 is also filled between the plastic support 41 and the battery cell unit 11 to seal the assembly gap between the battery cell explosion-proof valve of the battery cell unit 11 and the pressure relief portion of the plastic support 41, thereby avoiding the problem of the battery cell explosion-proof valve of the battery cell unit 11 being exposed.

[0053] When thermal runaway occurs in any battery cell unit 11, the battery cell unit 11 squeezes and breaks through the foamed colloid part 2 close to the battery cell explosion-proof valve, so that the high-temperature and high-pressure jet is released from the battery cell explosion-proof valve of the battery cell unit 11 and enters the pressure relief chamber, and finally the high-temperature and high-pressure jet is discharged to the outside of the pressure relief chamber under the guidance of the pressure relief chamber.

[0054] In addition to the above module fixing frame 3 including the fixing frame body 31 and the outer connecting portion 32 disposed on the fixing frame body 31, the inventor also provides another preferred solution. Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, the fixing frame body 31 includes a transition portion 311 and a force-bearing portion 312 extending along the first direction A, the transition portion 311 extends from the force-bearing portion 312 toward the outer connecting portion 32, and the transition portion 311 is connected to the outer connecting portion 32. Preferably, the force-bearing portion 312, the transition portion 311 and the outer connecting portion 32 are integrally formed to better ensure the structural strength and other comprehensive performances of the fixing frame body 31. Among them, the number of the outer connecting portions 32 is preferably configured to be two, and the two outer connecting portions 32 are connected to the two opposite sides of the force-bearing portion 312 through the corresponding transition portions 311. In this way, the two outer connecting portions 32 cooperate with the foam colloid member 2 to firmly install and fix each battery cell unit 11 on the box pair.

[0055] Further, please refer to Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the force-bearing portion 312 is provided with a cell avoidance groove 33 corresponding to each cell unit 11, and the inner wall of the cell avoidance groove 33 is coated with a structural adhesive layer 5, and the cell unit 11 is correspondingly embedded in the cell avoidance groove 33. In this way, not only the cell unit 11 is firmly limited, but also the radial direction of the cell unit 11 is well limited, so that the movement of several battery row modules in the first direction A and the arrangement direction B can be stably constrained. In addition, the peripheral side surface of the cell unit 11 is bonded to the inner wall of the cell avoidance groove 33 through the structural adhesive layer 5, so that the cell unit 11 of the battery row module will not be separated from the cell avoidance groove 33 of the fixing frame body 31.

[0056] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A power battery module, characterized in that: include: A plurality of battery row modules arranged in parallel, each of the battery row modules comprising a plurality of battery cell units (11), the plurality of battery cell units (11) being evenly arranged along a first direction A, the first direction A being perpendicular to an arrangement direction B of the plurality of battery row modules; A foamed colloid member (2), the foamed colloid member (2) being arranged between two adjacent battery core units (11), and the foamed colloid member (2) covering each battery core unit (11); A module fixing frame (3), the module fixing frame (3) is extended along the central axis direction C of the battery cell unit (11), the module fixing frame (3) is fixedly connected to the battery row module, and the foamed colloid member (2) cooperates with the module fixing frame (3) to fix the battery cell unit (11) from the peripheral side of the battery cell unit (11).

2. The power battery module according to claim 1, characterized in that: The module fixing frame (3) comprises a fixing frame body (31) and an external connection portion (32) arranged on the fixing frame body (31), wherein the external connection portion (32) is used for fixing the connection box to the counterpart, and the fixing frame body (31) is bonded to the battery row module.

3. The power battery module according to claim 2, characterized in that: The fixing frame body (31) is extended along an arrangement direction B of the plurality of battery row modules.

4. The power battery module according to claim 2, characterized in that: The fixing frame body (31) comprises a transition portion (311) and a force-bearing portion (312) extending along the first direction A, the transition portion (311) extending from the force-bearing portion (312) toward the outer connecting portion (32), and the transition portion (311) is connected to the outer connecting portion (32).

5. The power battery module according to claim 2, 3 or 4, characterized in that: The fixing frame body (31) is provided with a battery cell avoidance groove (33), and the battery cell avoidance groove (33) is adapted to the battery cell unit (11).

6. The power battery module according to claim 2, 3 or 4, characterized in that: At least one reinforcing rib (34) is disposed between the fixing frame body (31) and the outer connecting portion (32).

7. The power battery module according to claim 2, 3 or 4, characterized in that: A plurality of the battery row modules are arranged in parallel to form a battery pack (1), and the module fixing frames (3) are provided on two opposite sides of the battery pack (1).

8. The power battery module according to any one of claims 1 to 4, characterized in that: It also includes a pressure relief and heat dissipation component (4), each of the battery cell units (11) of the battery row module is arranged on the pressure relief and heat dissipation component (4) along the axis direction C thereof, and the battery cell explosion-proof valve of any battery cell unit (11) can be opened in a thermal runaway state, so that the corresponding battery cell unit (11) is connected to the pressure relief chamber of the pressure relief and heat dissipation component (4).

9. The power battery module according to claim 8, characterized in that: The pressure relief and heat dissipation component (4) comprises a plastic bracket (41) and a bracket outer cover (42) covering the plastic bracket (41); the plastic bracket (41) cooperates with the bracket outer cover (42) to form the pressure relief chamber; and the plastic bracket (41) is provided with a pressure relief portion corresponding to each of the battery cell units (11).

10. A battery pack, characterized in that: A power battery module comprising any one of claims 1 to 9.

Images