CN218334072U

CN218334072U - Power battery module

Info

Publication number: CN218334072U
Application number: CN202221983077.1U
Authority: CN
Inventors: 陈保国; 卢青梅; 兑瀚; 张福增
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2023-01-17
Anticipated expiration: 2032-07-29

Abstract

The utility model provides a power battery module, which comprises a battery component, a left module insulating part component, a left module end cover component, a module upper cover, a wire harness, a right module insulating part component, a right module end cover component and a module bottom shell; the left module end cover assembly is connected to one side of the battery assembly through the left module insulating part assembly, the right module end cover assembly is connected to the other side of the battery assembly through the right module insulating part assembly, the module upper cover is arranged on the upper end face of the battery assembly, the lower end face of the battery assembly is connected with the module bottom shell through the bi-component heat-conducting glue, and the module upper cover, the module bottom shell, the left module end cover assembly and the right module end cover assembly wrap the battery pack; and the inner sides of the left module end cover assembly and the right module end cover assembly are respectively provided with or coated with insulating layers for protecting the battery core lug and playing an insulating role. The utility model discloses reduce the space occupancy, improved space utilization, improved the volume energy density of group battery.

Description

Power battery module

Technical Field

The utility model belongs to the battery module field especially relates to a power battery module.

Background

With the development of new energy industry, electric vehicles are more and more widely applied. The soft package lithium ion battery has the advantages of light weight, high specific capacity, good safety performance, small internal resistance, flexible design and the like, and is widely used in the market. Of course, the endurance mileage, the stability and the safety of the battery of the electric vehicle are receiving more and more attention. How to improve the endurance mileage of the electric automobile, improve the energy density of the power battery, improve the safety of the power battery, and improve the heat dissipation capacity of the single battery becomes the key for the development of the electric automobile in future; the power battery module is used as the core of an energy system of the electric automobile, and the power battery module needs to have higher energy density, so that the electric automobile can effectively run for a longer distance, power must be stably and effectively provided, the problem caused by the failure of a single battery is avoided, and the safety and the reliability of the electric automobile are ensured;

at present, the soft package lithium ion battery module is generally designed by fixing the battery cells by using a plastic frame, and heat dissipation paths are increased by utilizing heat conduction metal plates between the battery cells or stamping liquid cooling plates for heat dissipation. Increase the weight that heat conduction metal sheet has not only increased the module between electric core for module energy density reduces to some extent, because there can not seamless laminating between heat conduction metal sheet and the module drain pan, must produce the thermal resistance and influence electric core heat transmission moreover. The technology of stamping the liquid cooling plate is not mature, and is not popularized and used.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a power battery module, which solves the above problems.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

power battery module, its characterized in that: the battery module comprises a battery module, a left module insulating part assembly, a left module end cover assembly, a module upper cover, a wire harness, a right module insulating part assembly, a right module end cover assembly and a module bottom shell;

the left module end cover assembly is connected to one side of the battery assembly through the left module insulating part assembly, the right module end cover assembly is connected to the other side of the battery assembly through the right module insulating part assembly, the module upper cover is arranged on the upper end face of the battery assembly, the lower end face of the battery assembly is connected with the module bottom shell through the bi-component heat-conducting glue, and the module upper cover, the module bottom shell, the left module end cover assembly and the right module end cover assembly wrap the battery pack; the wire harness is used for connecting the left module insulating part assembly and the right module insulating part assembly;

and the inner sides of the left module end cover assembly and the right module end cover assembly are respectively provided with or coated with insulating layers for protecting the electrode lugs of the battery core and playing an insulating role.

Furthermore, the battery assembly consists of a plurality of battery units and a plurality of buffer mechanisms, and the buffer mechanisms are used for dealing with the expansion of the battery units; the buffer mechanism consists of a fireproof layer and an elastic layer, wherein the fireproof layer can play an insulating role, so that external heat is prevented from being transmitted into the module through the side surface, and the heat is prevented from being transmitted to the outside when the module is out of control; the elastic layer can counteract and compensate expansion force and displacement change caused by battery expansion.

Further, left side module end cover subassembly and right side module end cover subassembly are equipped with a plurality of fixed orificess, the fixed orifices is used for the volume between module and the system to be fixed, and the fixed orifices can also be used for the hoist and mount.

Further, the module upper cover is equipped with injecting glue hole and exhaust hole, the injecting glue hole is used for gluing to the inside heat conduction structure that pours into of module, the exhaust hole is with gas outgoing when being used for the injecting glue, and the module upper cover still is equipped with protruding muscle, protruding muscle is used for dodging the temperature of pencil.

Further, left side module insulating part subassembly and right module insulating part subassembly structure are the same, and right module insulating part subassembly includes right module insulating part body, main positive Busbar, main negative Busbar, the Busbar that establishes ties, and the installation of cylinder direction is passed through to series connection Busbar and main negative Busbar, and main positive Busbar and main negative Busbar pass through the buckle location to it is fixed to form the mushroom head through the hot riveting cylinder, in order to realize to main positive Busbar, the complete spacing of series connection Busbar and main negative Busbar.

Furthermore, the main positive busbar and the main negative busbar are provided with chamfers; the series connection busbar is provided with an identification hole, and the identification hole and the chamfer are used for identification and positioning.

Further, the fireproof layer is made of mica materials or ceramic fiber materials; the elastic layer is one of foam, PU, EPDM, CR material.

Furthermore, the wire harness is composed of an FPC, a nickel sheet, a low-voltage connector and a packaging temperature sensor.

Furthermore, the cross section of the module bottom shell is of a U-shaped structure, and positioning grooves are formed in two ends of the module bottom shell and used for being matched with the module upper cover.

Furthermore, the cross section of the module upper cover is also in a U-shaped structure, and the thickness of the module upper cover is smaller than that of the module bottom shell; and the left module end cover component and the right module end cover component are also provided with end cover grooves matched with the module upper cover.

Compared with the prior art, power battery module have following advantage:

(1) Power battery module, simplify the pencil, for arranging of pencil leaves the space, dodge the temperature sensing on the pencil.

(2) Power battery module, reduced the space occupancy, improve space utilization, improved the volume energy density of group battery.

(3) Power battery module, at electric core charging and discharge's in-process, through the thickness change of buffer gear reply electric core, offset the dimensional change.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is an exploded schematic view of a power battery module according to an embodiment of the present invention;

fig. 2 is a schematic view of a buffering mechanism according to an embodiment of the present invention;

fig. 3 is a schematic view of an upper cover of the module according to an embodiment of the present invention;

fig. 4 is a schematic view of a bottom case of the module according to an embodiment of the present invention;

fig. 5 is a schematic view of a right module insulator assembly according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a battery assembly according to an embodiment of the present invention.

Description of reference numerals:

1. a battery assembly; 11. a battery cell; 12. a buffer mechanism; 121. a fire-resistant layer; 122. an elastic layer; 2. a left module insulator assembly; 3. a left module end cap assembly; 4. a module upper cover; 41. injecting glue holes; 42. an exhaust hole; 43. a rib is protruded; 5. a wire harness; 6. a right module insulator assembly; 61. a main positive Busbar; 62. busbar is connected in series; 63. main negative Busbar; 64. a right module insulator body; 611. chamfering; 7. a right module end cap assembly; 8. a module bottom case; 9. and (4) heat-conducting glue.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

A power battery module, as shown in fig. 1-6, including a battery assembly 1, a left module insulator assembly 2, a left module end cover assembly 3, a module upper cover 4, a harness 5, a right module insulator assembly 6, a right module end cover assembly 7, and a module bottom case 8;

the left module end cover assembly 3 is connected to one side of the battery assembly 1 through the left module insulating part assembly 2, the right module end cover assembly 7 is connected to the other side of the battery assembly 1 through the right module insulating part assembly 6, the module upper cover 4 is arranged on the upper end face of the battery assembly 1, the lower end face of the battery assembly 1 is connected with the module bottom shell 8 through the bi-component heat-conducting glue 9, and the module upper cover 4, the module bottom shell 8, the left module end cover assembly 3 and the right module end cover assembly 7 wrap the battery pack; the wire harness 5 is used for connecting the left module insulator component 2 and the right module insulator component 6;

and insulating layers are respectively arranged or coated on the inner sides of the left module end cover component 3 and the right module end cover component 7 and used for protecting the electrode lugs of the battery core and playing an insulating role.

Preferably, the battery assembly 1 is composed of a plurality of battery cells 11 and a plurality of buffer mechanisms 12, wherein the buffer mechanisms 12 are used for dealing with the expansion of the battery cells 11; offsetting and compensating expansion force and displacement change caused by battery expansion; the buffer mechanism 12 is composed of a fireproof layer 121 and an elastic layer 122, wherein the fireproof layer 121 can play an insulating role, so that external heat is prevented from being transmitted into the buffer mechanism through the side surface, and heat is prevented from being transmitted to the outside when the module is out of control; the elastic layer 122 can compensate and offset expansion force and displacement change caused by battery expansion.

Preferably, left side module end cover subassembly 3 and right side module end cover subassembly 7 are equipped with a plurality of fixed orificess, the fixed orifices is used for the volume between module and the system fixed, and the fixed orifices can also be used for the hoist and mount.

Preferably, the module upper cover 4 is provided with a glue injection hole 41 and an exhaust hole 42, the glue injection hole 41 is used for injecting heat-conducting structural glue into the module, and the heat-conducting structural glue can connect the module bottom case 8 with the left module insulating member assembly 2 and the right module insulating member assembly 6, so that connecting pieces are reduced, and the energy density of the power battery module and the stability of the power battery module are improved;

the exhaust holes 42 are used for exhausting gas during glue injection, and the gas is exhausted through the exhaust holes 42, so that the heat-conducting structural glue flows uniformly on two sides of the module, and air holes are avoided; and module upper cover 4 still is equipped with protruding muscle 43, protruding muscle 43 is used for dodging the thalposis of pencil 5, reserves the space for the thalposis, avoids the upper cover to pass through thalposis extrusion battery sheet.

Preferably, left module insulator subassembly 2 is the same with right module insulator subassembly 6 structure, and right module insulator subassembly 6 includes right module insulator body 64, main positive Busbar, main negative Busbar, the series connection Busbar, and series connection Busbar62 and main negative Busbar63 pass through the cylinder direction installation, and main positive Busbar61 and main negative Busbar63 pass through the buckle location to it is fixed to form the mushroom head through the hot riveting cylinder, in order to realize the complete spacing to main positive Busbar61, series connection Busbar62 and main negative Busbar 63.

After the cell lug is bent, the cell lug is connected with the Busbar through laser welding, so that series-parallel connection of the cell and extraction of the anode and the cathode of the module are realized

Preferably, the main positive busbar and the main negative busbar are both provided with a chamfer 611; the serial connection busbar is provided with an identification hole, and the identification hole and the chamfer 611 are used for identifying and positioning and welding an identification position, so that the accurate positioning of welding is realized, and the welding quality is ensured.

Preferably, the fireproof layer 121 is made of mica or ceramic fiber; the fireproof layer 121 can be made of mica, but not only is made of mica, but also can be made of ceramic fiber, can resist the temperature of 1000 ℃, protects the internal single battery, plays an insulating role, prevents external heat from being transmitted into the internal single battery through the side surface, and prevents the heat from being transmitted to the outside when the module is out of control; the elastic layer 122 is made of one of foam, PU, EPDM and CR materials; but not limited thereto, other materials having good elasticity and heat retaining property may be used to compensate and compensate for the expansion force and displacement change caused by the expansion of the battery.

Preferably, the wiring harness 5 is composed of an FPC, a nickel sheet, a low-voltage connector and a packaging temperature sensor; a circuit is pressed in the FPC, and after the FPC is assembled and welded, real-time voltage and real-time temperature of the battery cell can be acquired. 5 designs of pencil adopt FPC integrated mode, and the lightweight design has reduced the quantity of structural component, has improved space utilization, has improved the space energy density and the quality energy density of battery module.

Preferably, the cross section of the module bottom shell 8 is of a U-shaped structure, and positioning grooves are formed in two ends of the module bottom shell 8 and used for being matched with the module upper cover 4.

Preferably, the cross section of the module upper cover 4 is also in a U-shaped structure, and the thickness of the module upper cover 4 is smaller than that of the module bottom shell 8; and the left module end cover assembly 3 and the right module end cover assembly 7 are also provided with end cover grooves matched with the module upper cover 4.

Glue blocking strips are attached to the left end and the right end of the inner side of the module bottom shell 8, so that the bottom surface of the inner cavity of the module bottom shell 8 forms a structure with four sides surrounding mountains, and two components of heat-conducting glue 9 can be conveniently injected. Two ingredient heat conduction glues 9, connects battery pack 1 and module drain pan 8, and the battery heat is glued 9 transmission to the drain pan through the heat conduction, has shortened transmission path, has promoted electric core radiating effect.

Left module end cover subassembly 3, right module end cover subassembly 7, module upper cover 4 and module drain pan 8 are light-weight aluminium alloy material, and left module end cover subassembly 3 and right module end cover subassembly 7 adopt cast aluminium technology or extrude the technology, and module upper cover 4 and module drain pan 8 adopt panel beating punching press bending process, and existing welding that does benefit to, reduce cost has wholly reduced the weight of power battery module, is favorable to promoting the energy density of power battery module.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Power battery module, its characterized in that: the battery module comprises a battery assembly, a left module insulating part assembly, a left module end cover assembly, a module upper cover, a wire harness, a right module insulating part assembly, a right module end cover assembly and a module bottom shell;

and the inner sides of the left module end cover assembly and the right module end cover assembly are respectively provided with or coated with insulating layers for protecting the battery core lug and playing an insulating role.

2. The power battery module of claim 1, wherein: the battery assembly consists of a plurality of battery units and a plurality of buffer mechanisms, wherein the buffer mechanisms are used for dealing with the expansion of the battery units; the buffer mechanism consists of a fireproof layer and an elastic layer, wherein the fireproof layer can play an insulating role, so that external heat is prevented from being transmitted into the module through the side surface, and the heat is prevented from being transmitted to the outside when the module is out of control; the elastic layer can counteract and compensate expansion force and displacement change caused by battery expansion.

3. The power battery module of claim 1, wherein: left side module end cover subassembly and right side module end cover subassembly are equipped with a plurality of fixed orificess, the fixed orifices is used for the volume between module and the system fixed, and the fixed orifices can also be used for the hoist and mount.

4. The power battery module of claim 1, wherein: the module upper cover is equipped with injecting glue hole and exhaust hole, the injecting glue hole is used for gluing to the inside heat conduction structure that pours into of module, the exhaust hole is with gaseous discharge when being used for the injecting glue, and the module upper cover still is equipped with protruding muscle, protruding muscle is used for dodging the temperature of pencil.

5. The power battery module of claim 1, wherein: left side module insulating part subassembly and right module insulating part subassembly structure are the same, and right module insulating part subassembly includes right module insulator body, main positive Busbar, main negative Busbar, the series connection Busbar, and the installation of cylinder direction is passed through to series connection Busbar and main negative Busbar, and main positive Busbar and main negative Busbar pass through the buckle location to it is fixed to form the mushroom head through the hot riveting cylinder, and it is completely spacing to realize main positive Busbar, series connection Busbar and main negative Busbar.

6. The power battery module of claim 5, wherein: the main positive busbar and the main negative busbar are provided with chamfers; the serial connection busbar is provided with an identification hole, and the identification hole and the chamfer are used for identification and positioning.

7. The power battery module of claim 2, wherein: the fireproof layer is made of mica materials or ceramic fiber materials; the elastic layer is one of foam, PU, EPDM, CR material.

8. The power battery module of claim 2, wherein: the wire harness is composed of an FPC, a nickel sheet, a low-voltage connector and a packaging temperature sensor.

9. The power battery module of claim 1, wherein: the cross section of the module bottom shell is of a U-shaped structure, and positioning grooves are formed in two ends of the module bottom shell and used for being matched with the module upper cover.

10. The power battery module of claim 9, wherein: the cross section of the module upper cover is also in a U-shaped structure, and the thickness of the module upper cover is smaller than that of the module bottom shell; and the left module end cover component and the right module end cover component are also provided with end cover grooves matched with the module upper cover.