Power battery module and battery pack

Abstract

A power battery module, comprising: a plurality of battery row units arranged in parallel, wherein each battery row unit comprises one or more cell units (11), the one or more cell units (11) are uniformly arranged in a first direction A, and the first direction A is perpendicular to an arrangement direction B of one or more battery row units; a foamed adhesive (2) arranged between two adjacent cell units (11) and covering the cell units (11); and module fixing brackets (3) extending in the central axis direction C of the cell units (11) and fixedly connected to the battery row units, wherein the foamed adhesive (2) cooperates with the module fixing brackets (3) to fix the cell units (11) from the peripheral side surface of the cell units (11).

Description

Power battery module and battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024214246186 filed on June 20, 2024 with the China Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of battery, in particular to a power battery module and a battery pack. BACKGROUND

[0003] In the existing battery pack, the battery cells of the cylindrical power battery module are usually placed vertically, and the corresponding mounting and fixing structure is in the form of a tray, that is, the existing tray is used to mount and fix the battery cells. TECHNICAL PROBLEM

[0004] Since the tray itself will occupy a certain space, when the cylindrical power battery module is configured with a pressure relief system, the overall height of the cylindrical power battery module includes the first height dimension of the tray, the height of the battery cell along the central axis, and the second height dimension of the pressure relief system, so that the overall height of the battery pack is relatively high. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a power battery module, comprising:

[0006] One or more battery row modules arranged side by side, each battery row module has one or more battery cell units, and the one or more battery cell units are arranged uniformly along a first direction A, wherein the first direction A is perpendicular to the arrangement direction B of the one or more battery row modules;

[0007] A foamed gel member is arranged between two adjacent battery cell units, and the foamed gel member covers each battery cell unit;

[0008] A module fixing frame is arranged 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 foamed gel member cooperates with the module fixing frame to fix the battery cell unit from the side surface of the battery cell unit.

[0009] In a second aspect, a battery pack comprises the power battery module described above. ADVANTAGEOUS EFFECTS

[0010] By cooperation between the foamed colloid piece and the module fixing frame, each cell unit of the battery row module can be constrained in the radial direction, so that the existing tray installation fixing mode is replaced, and the height size of the existing cylindrical power battery module is reduced under the premise of ensuring the assembly stability of each cell unit. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is an overall explosion structural diagram of a power battery module according to the present application;

[0012] Fig. 2 is a first structural diagram of a first embodiment of a power battery module according to the present application;

[0013] Fig. 3 is a second structural diagram of the first embodiment of the power battery module according to the present application;

[0014] Fig. 4 is a first assembly top view of a power battery module according to the present application;

[0015] Fig. 5 is a cross-sectional view of A-A in Fig. 4;

[0016] Fig. 6 is a local enlarged view of B in Fig. 5;

[0017] Fig. 7 is a second structural diagram of a second embodiment of a power battery module according to the present application;

[0018] Fig. 8 is a second assembly top view of a power battery module according to the present application;

[0019] Fig. 9 is a cross-sectional view of C-C in Fig. 8;

[0020] Fig. 10 is a local enlarged view of D in Fig. 9.

[0021] Fig. 10 is a local enlarged view of D in Fig. 9. Embodiments of the present application

[0022] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0024] First embodiment

[0025] The application discloses a battery pack, which comprises a box and a power battery module, and the power battery module is installed in the box. The box is a mature technology in the art, and the application does not make significant improvements to the box, so the box is not described and shown in detail.

[0026] As the core scheme of the embodiment, the power battery module comprises a foamed colloid member 2, a module fixing frame 3 and one or more battery row modules arranged side by side, wherein each battery row module has one or more battery cell units 11, and the one or more battery cell units 11 are arranged uniformly along a first direction A, and the first direction A is perpendicular to the arrangement direction B of the one or more battery row modules.

[0027] In some embodiments, the battery cell unit 11 is a cylindrical battery, and the battery cell unit 11 has a battery positive electrode end and a battery negative electrode end arranged opposite to each other. The battery explosion-proof valve of the battery cell unit 11 can be located close to the battery positive electrode end of the battery cell unit 11, and in other designs, the battery explosion-proof valve of the battery cell unit 11 can also be located at the battery negative electrode end of the battery cell unit 11. The one or more battery cell units 11 are connected in series and parallel through a conductive row. In addition, the battery positive electrode end of each battery cell unit 11 in the battery row module is located on the same side, and the battery positive electrode ends of the battery cell units 11 of the adjacent two battery row modules are preferably staggered.

[0028] In the embodiment, as shown in FIGS. 5 and 6, the foamed colloid member 2 is arranged between the adjacent two battery cell units 11, and the foamed colloid member 2 covers each battery cell unit 11. Specifically, the foamed colloid member 2 wraps the circumferential side of the battery cell unit 11 and the battery explosion-proof valve of the battery cell unit 11. The foamed colloid member 2 herein belongs to polyurethane or silicone glue, which is not limited here. In this way, the battery cell unit 11 is completely wrapped by the foamed colloid member 2, which not only has good flame-retardant and heat-insulating ability, but also can avoid the heat, material and flame of any battery cell unit 11 after thermal runaway from being transmitted to the adjacent battery cell unit 11, and under the action of the foamed colloid member 2, the one or more battery cell units 11 can be tightly combined and connected together.

[0029] In some embodiments, as shown in FIG. 1, FIG. 5 and FIG. 6, the module fixing frame 3 is arranged along the central axis direction C of the battery cell unit 11, and is fixedly connected to the battery row module. The foamed adhesive member 2 cooperates with the module fixing frame 3 to fix the battery cell unit 11 from the circumferential side of the battery cell unit 11, that is, the foamed adhesive member 2 cooperates with the module fixing frame 3 to act on the circumferential side of the battery cell unit 11, so that each battery cell unit 11 can be constrained in the radial direction and the central axis direction C, achieving the purpose of fixing each battery cell unit 11.

[0030] It should be noted that the central axis direction C here is the height direction of the battery cell unit 11.

[0031] Specifically, the module fixing frame 3 acts on the circumferential side of the battery cell unit 11 in the battery row module, directly constraining the movement of each battery cell unit 11 in the radial direction. When the module fixing frame 3 is fixed to the box handle, one or more battery row modules can be stably constrained, so that the one or more battery row modules remain stationary. At the same time, the foamed adhesive member 2 adheres to the circumferential 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 constrain the movement of each battery cell unit 11 in the central axis direction C.

[0032] In some embodiments, as shown in FIG. 1 to FIG. 6, the module fixing frame 3 includes a fixing frame body 31 and an outer connecting part 32 arranged on the fixing frame body 31, and the fixing frame body 31 is bonded to the battery row module. Wherein, the side of the fixing frame body 31 used for being close to and acting 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 for being away from the battery row module is defined as the outer side of the fixing frame body 31.

[0033] Specifically, the inner side of the fixing frame body 31 is coated with a structural adhesive layer 5, and other types of adhesive can also be selected according to the structure design and design requirements. Of course, the structural adhesive layer 5 can be coated on part of the inner side of the fixing frame body 31, or can be coated on the entire inner side of the fixing frame body 31. The adhesion of the structural adhesive layer 5 enables the battery cell unit 11 close to the fixing frame body 31 in the battery row module to be bonded to the fixing frame body 31.

[0034] In some embodiments, the circumferential side of the battery cell unit 11 near the fixed frame body 31 of the battery row module is covered by the foamed adhesive member 2, and the part of the circumferential side of the battery cell unit 11 not covered by the foamed adhesive member 2 is connected by the structural adhesive layer 5. Of course, the circumferential side of the battery cell unit 11 near the fixed frame body 31 of the battery row module can also be completely covered by the foamed adhesive member 2, and the foamed adhesive member 2 and the structural adhesive layer 5 are connected.

[0035] In some embodiments, the circumferential side of the battery cell unit 11 near the fixed frame body 31 of the battery row module is covered by the foamed adhesive member 2, and the part of the circumferential side of the battery cell unit 11 not covered by the foamed adhesive member 2 is connected by the structural adhesive layer 5. Of course, the circumferential side of the battery cell unit 11 near the fixed frame body 31 of the battery row module can also be completely covered by the foamed adhesive member 2, and the foamed adhesive member 2 and the structural adhesive layer 5 are connected.

[0036] In the installation process, the structural adhesive layer 5 is first formed in the battery cell avoiding groove 33 of the fixed frame body 31, and the module fixed frame 3 and the one or more battery row modules are connected by the structural adhesive layer 5, and then the foamed adhesive member 2 is injected between the one or more battery row modules, so that the module fixed frame 3 and the one or more battery row modules are reliably connected.

[0037] In some embodiments, as shown in FIGS. 2, 3 and 6, the above-mentioned fixed frame body 31 is arranged along the arrangement direction B of the one or more battery row modules, that is, the first direction A of each battery row module is perpendicular to the inner side of the frame body of the fixed frame body 31. And each fixed frame body 31 is connected to the battery row module, so that, combined with the foamed adhesive member 2, each battery cell unit 11 can be stably installed and fixed on the box pair member.

[0038] In some embodiments, as shown in FIGS. 1 and 4, the one or more battery row modules are arranged side by side to form a battery pack 1, and the battery pack 1 is provided with a module fixed frame 3 on both opposite sides. Specifically, two module fixed frames 3 are arranged in the first direction A of the battery pack 1, and the two module fixed frames 3 are arranged on the two opposite sides of the battery pack 1, so that the power battery module can be more stably assembled on the box pair member, and the battery pack will not be loose due to vibration and shaking during use.

[0039] In some embodiments, as shown in FIG. 2, at least one reinforcing rib 34 is arranged between the fixed frame body 31 and the outer connecting portion 32 to enhance the structural strength of the module fixed frame 3, thereby improving the stability and stability of the power battery module and the battery pack as a whole.

[0040] In some embodiments, the power battery module further comprises a pressure relief and heat dissipation member 4, and each battery cell unit 11 of the battery pack 1 module is arranged along the axial direction C of the pressure relief and heat dissipation member 4, i.e., the pressure relief and heat dissipation member 4 covers each battery cell unit 11 in the orthographic projection direction, and the 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 member 4. In this way, when any battery cell unit 11 experiences thermal runaway, the high-temperature and high-pressure jet released by the battery cell unit 11 can be ensured to impact the pressure relief chamber of the pressure relief and heat dissipation member 4.

[0041] In some embodiments, as shown in FIG. 1, the pressure relief and heat dissipation member 4 comprises a plastic bracket 41 and a bracket cover 42 covering the plastic bracket 41, and the plastic bracket 41 cooperates with the bracket cover 42 to form the pressure relief chamber described above. The plastic bracket 41 is provided with a pressure relief portion corresponding to each battery cell unit 11.

[0042] Specifically, the pressure relief portion can be an exhaust hole or a weak portion. The foamed colloid member 2 is also filled between the plastic bracket 41 and the battery cell unit 11 to seal the assembly gap between the explosion-proof valve of the battery cell unit 11 and the pressure relief portion of the plastic bracket 41, thereby avoiding the problem of exposure of the explosion-proof valve of the battery cell unit 11.

[0043] When any battery cell unit 11 experiences thermal runaway, the battery cell unit 11 extrudes and breaks through the foamed colloid member 2 near the explosion-proof valve, so that the high-temperature and high-pressure jet is released from the 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 and released to the outside of the pressure relief chamber under the guidance of the pressure relief chamber.

[0044] In addition to the above-mentioned module fixing frame 3 comprising a fixing frame body 31 and an outer connecting portion 32 arranged on the fixing frame body 31, in some embodiments, specifically in combination with FIGS. 7, 8, 9 and 10, the fixing frame body 31 comprises a transition portion 311 and a stress portion 312 extending along the first direction A, the transition portion 311 extends from the stress portion 312 to the outer connecting portion 32, and the transition portion 311 is connected to the outer connecting portion 32. In some embodiments, the stress portion 312, the transition portion 311 and the outer connecting portion 32 are integrally formed to better ensure the structural strength and other comprehensive performance of the fixing frame body 31. Among them, in some embodiments, the number of outer connecting portions 32 is configured to be two, and the two outer connecting portions 32 are connected to the two opposite sides of the stress portion 312 through the corresponding transition portions 311. In this way, the two outer connecting portions 32 cooperate with the foamed glue body 2, which can stably install and fix each battery cell unit 11 on the box body.

[0045] In some embodiments, specifically as shown in FIGS. 7, 8, 9 and 10, the stress portion 312 is provided with a battery cell avoiding groove 33 corresponding to each battery cell unit 11, the inner wall of the battery cell avoiding groove 33 is coated with a structural adhesive layer 5, and the battery cell unit 11 is correspondingly embedded in the inside of the battery cell avoiding groove 33. In this way, not only the battery cell unit 11 is stably positioned, but also the radial direction of the battery cell unit 11 is well positioned, so as to stably constrain the movement of one or more battery row modules in the first direction A and the arrangement direction B. In addition, the circumferential surface of the battery cell unit 11 is bonded with the inner wall of the battery cell avoiding groove 33 through the structural adhesive layer 5, so that the battery cell unit 11 of the battery row module cannot be separated from the battery cell avoiding groove 33 of the fixing frame body 31.

Claims

1. A power battery module, comprising: one or more battery row modules arranged side by side, each of the battery row modules having one or more battery cell units (11) arranged uniformly along a first direction A, the first direction A being perpendicular to a direction B of arrangement of the one or more battery row modules; a foamed colloid member (2) arranged between two adjacent battery cell units (11) and covering each of the battery cell units (11); a module fixing frame (3) extending along a central axis direction C of the battery cell units (11), the module fixing frame (3) being fixedly connected to the battery row modules, and the foamed colloid member (2) cooperating with the module fixing frame (3) to fix the battery cell units (11) from the side of the battery cell units (11).

2. The power battery module of claim 1, wherein: The module fixing frame (3) comprises a fixing frame body (31) and an outer connecting portion (32) provided on the fixing frame body (31), the outer connecting portion (32) being used for fixedly connecting a box pair of hands, and the fixing frame body (31) being bonded to the battery row modules.

3. The power battery module of claim 2, wherein: The fixing frame body (31) extends along the direction B of arrangement of the one or more battery row modules.

4. The power battery module of claim 2, wherein: The fixing frame body (31) comprises a transition portion (311) and a stress receiving portion (312) extending along the first direction A, the transition portion (311) extending from the stress receiving portion (312) towards the outer connecting portion (32), and the transition portion (311) being connected to the outer connecting portion (32).

5. The power battery module according to claim 2 or 3 or 4, wherein: The fixing frame body (31) is provided with a battery cell avoiding groove (33) matched with the battery cell units (11).

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

7. The power battery module according to claim 2 or 3 or 4, wherein: The one or more battery row modules are arranged side by side into a battery pack (1), and the battery pack (1) is provided with the module fixing frame (3) on both opposite sides. 8.The power battery module according to any one of claims 1 to 4, further comprising a pressure relief and heat dissipation member (4), each of the battery cell units (11) of the battery pack (1) module being arranged along a central axis direction C thereof in the pressure relief and heat dissipation member (4), and a battery cell explosion-proof valve of any one of the battery cell units (11) being capable of being opened in a thermal runaway state, so that the corresponding battery cell unit (11) is communicated with a pressure relief chamber of the pressure relief and heat dissipation member (4).

9. The power battery module of claim 8, wherein: The pressure relief and heat dissipation member (4) comprises a plastic support (41) and a support outer cover (42) covering the plastic support (41), the plastic support (41) and the support outer cover (42) being matched to form the pressure relief chamber, and the plastic support (41) being provided with a pressure relief portion corresponding to each of the battery cell units (11). 10.A battery pack comprising the power battery module according to any one of claims 1 to 9.

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