Nickel-metal hydride battery module

Abstract

The utility model discloses a nickel-metal hydride battery module which comprises a plurality of single batteries and a protective shell, positive and negative electrodes of the single batteries are sequentially welded and connected in series to form a battery pack, the protective shell is arranged outside the battery pack and comprises a first shell and a second shell which are connected through a buckle, and the first shell and the second shell are buckled to form an accommodating cavity of the battery pack. Bosses internally provided with blind holes are arranged at the two ends of the bottom of the first shell, the blind holes are in threaded connection with fixing bolts connected with a frame, inclined faces are arranged on the inner sides of the bosses on the two sides, unfilled corners are arranged at the positions, opposite to the bosses and the inclined faces, of the second shell, and the rest parts of the first shell and the rest parts of the second shell are of symmetrical structures. According to the utility model, the single batteries are fixed in the protective shell and are connected in series to form a group, and the bottom of the protective shell is provided with the heat dissipation holes and the blind holes screwed with the fixed bolts, so that the insulation and heat dissipation of the module are realized, the self power consumption of the module caused by the conduction of condensate water to the frame is avoided, and the module has the characteristics of good group consistency, simple assembly and sealing process, and good insulation and heat dissipation performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery grouping, and particularly relates to a nickel-hydrogen battery module. Background Art

[0002] Nickel-metal hydride battery is a battery product with high technical maturity. It is often used in oil-electric hybrid vehicles because of its high energy density, fast charge and discharge, good low-temperature performance, stable quality, no dendrite formation during use, high safety, and long cycle life. A common structure of nickel-metal hydride battery is a cell unit consisting of a metal shell, positive and negative electrodes, a diaphragm, and an electrolyte. The metal shell can be made of stainless steel, nickel-plated carbon steel, etc. The positive and negative electrodes are respectively connected to the positive and negative output poles on the metal shell, and the metal shell is directly connected to the negative electrode.

[0003] The application of existing nickel-hydrogen batteries as power sources for passenger cars usually has specific size requirements for the battery modules used. The grouping structure is usually a large module form in which independent internal battery cells are connected in series to form an integrated structure. That is, a shell of a specific size is designed according to the requirements of the vehicle model, and the internal space of the shell is divided into multiple chambers. In each chamber, a battery cell unit with positive and negative electrodes and a diaphragm is independently formed. The positive and negative electrodes of each battery cell unit are connected in series to form a large module structure with a higher voltage. The grouping efficiency of this grouping structure is high, which can effectively improve the energy density of the battery pack. However, on the one hand, the battery cells used lack control indicators corresponding to the electrical performance indicators after electrochemical activation, and the consistency and controllability of the large battery are poor. There is a barrel effect and the problem of redundant capacity waste of some battery cells. On the other hand, when assembled into a vehicle When assembling a battery system, in order to ensure mutual insulation between each battery pack, a plastic shell or a stainless steel shell plus a plastic side panel is usually used. The former has great difficulty in heat dissipation and poor battery stability. The latter requires sealing between two different materials, which is difficult to process and not easy to achieve. It is easy to cause leakage after assembly, shortening the battery life. In addition, when assembling into a vehicle battery system, the battery module is usually fixed directly to the frame with bolts. Because the metal shell of the nickel-hydrogen battery easily absorbs the hot and humid air from the outside to form condensed water, and the metal shell is also used as the negative electrode with a certain electromotive force, the condensed water will also be charged. When there is a lot of condensed water, a liquid flow contacts the fixing bolts and is connected to the frame through the fixing bolts, thereby forming a potential difference between the battery system and the frame, resulting in an increase in the self-consumption of the battery system. Utility Model Content

[0004] The purpose of the utility model is to provide a nickel-metal hydride battery module, which solves the problem that the existing nickel-metal hydride battery modules for passenger cars have low consistency controllability, high sealing process requirements, and cannot effectively prevent condensed water from conducting electricity and increasing self-consumption.

[0005] The utility model is realized by the following technical solutions:

[0006] The utility model proposes a nickel-hydrogen battery module, comprising a plurality of single cells, wherein the single cells have a square metal shell, the top of the metal shell is provided with a pressure relief safety valve, the metal shell is the negative electrode of the single cell, the right side of the metal shell is insulated and provided with the positive electrode of the single cell, the single cells are arranged in a single row and sequentially connected in series to form a battery pack, the battery pack is provided with a protective shell, the protective shell comprises a first shell and a second shell connected in a snap-on manner, the first shell and the second shell are snapped together to form a receiving cavity of the battery pack, bosses are provided at both ends of the bottom of the first shell, at least one of the bosses is provided with a blind hole, a fixing bolt connected to a vehicle frame is screwed to the blind hole, an inclined surface is provided on the opposite side of the boss, the position of the second shell relative to the boss and the inclined surface is set as a missing angle, and except for the missing angle position, the first shell and the second shell are mutually symmetrical structures;

[0007] Based on the above technical features, by connecting single cells in series to form a module, the consistency level of the battery module can be improved, and waste caused by excess capacity of some single cells can be avoided. At the same time, by setting a protective shell, relative fixation between single cells and insulation between adjacent battery modules can be achieved, and there is no need for additional insulation protection between single cells. At the same time, by screwing the fixing bolts to the blind holes at the bottom of the first shell, the charged condensed water can be effectively prevented from being conducted to the frame through the fixing bolts, thereby avoiding the charging of the frame and the additional power loss caused by the battery module, which has a better protective effect on the battery module.

[0008] Furthermore, the series connection of the single cells is that the positive electrode of the previous single cell is welded and fixed to the metal shell of the next single cell to form a series connection. This design makes the electrical connection between the single cells more stable, can effectively reduce the contact resistance between the single cells, and improve the current capacity and grouping efficiency of the battery module.

[0009] Furthermore, the protective shell is provided with several groups of first fastening parts, the first fastening parts include U-shaped fastening holes and wedge-shaped convex buckles, the U-shaped fastening holes are dispersed on the four sides of the second shell, and the convex buckles are arranged on the first shell and opposite to the U-shaped fastening holes. This design can make the first shell and the second shell form a tighter connection state to prevent the single battery from shifting.

[0010] Furthermore, a heat dissipation hole is opened at the bottom of the protective shell, and the heat dissipation hole is in a grille shape. This design allows external air to enter the protective shell to achieve heat dissipation of the single cell. Compared with the traditional battery module, there is no need to additionally set a heat sink between the single cells. At the same time, the grille can provide better support for the single cell and absorb some vibrations during use.

[0011] Furthermore, the inner surfaces of the first shell and the second shell are both provided with ribs. After the first shell and the second shell are buckled together, the ribs interfere with the single battery. This design can further limit the movement of the single battery, and at the same time form an air flow duct between the single battery and the protective shell, which is more conducive to heat dissipation.

[0012] Furthermore, the top and bottom of the protective shell are respectively provided with insertion holes for temperature probes, so as to facilitate the monitoring of the temperature values ​​of the top and bottom of the battery module.

[0013] Furthermore, an anti-sway bracket for a temperature sensing probe is protruded from the outside of the insertion hole at the top of the protective shell to prevent the top temperature sensing probe from shaking and causing inaccurate monitoring values.

[0014] Furthermore, the outer surface of the protective shell is provided with several groups of second fastening parts, and the second fastening parts include a second protrusion and a second fastening hole, and the second protrusion and the second fastening hole are respectively arranged on the first shell and / or the second shell. This design can enable adjacent battery modules to be tightly connected and improve the space utilization of the frame.

[0015] Preferably, the first shell and the second shell are provided with the second convex buckle parts and the second buckle holes at the same time, and the number of the second convex buckle parts and the second buckle holes are the same and symmetrically distributed, so as to make the connection between adjacent battery modules more stable.

[0016] Preferably, the second convex buckle portion is a cylindrical protrusion, a single-sided wedge-shaped protrusion or a combination of the two, and the second buckling hole is a shape matching the convex buckle portion.

[0017] Beneficial Effects

[0018] One of the above technical solutions has the following advantages or beneficial effects:

[0019] 1. By directly using the metal shell of the single battery as the output negative electrode, fixing the single battery in the protective shell and fixing it in series by welding, and providing heat dissipation holes and blind holes for screwing fixing bolts at the bottom of the protective shell, insulation and heat dissipation between battery modules are achieved, and the battery module is prevented from being connected to the frame through charged condensed water and fixing bolts, thereby avoiding the frame being charged and the battery module from generating additional power loss. The battery module using this structure has the characteristics of small contact resistance between single batteries, large current capacity, good grouping consistency, simple module assembly and sealing process, good insulation protection performance and heat dissipation performance, and low self-power consumption.

[0020] 2. By setting up a protective shell, the size difference after different modules are grouped can be eliminated, which is more suitable for application in models using standardized modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0022] Figure 1 It is an exploded schematic diagram of the utility model;

[0023] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 3 For the utility model Figure 2 The structural diagram of part A in the figure;

[0025] Figure 4 This is a schematic diagram of the structure of the utility model without the second housing;

[0026] Figure 5 The second housing structure of the utility model is shown in FIG. Figure 1 ;

[0027] Figure 6 The second housing structure of the utility model is shown in FIG. Figure 2 ;

[0028] In the figure: a single cell 1; a battery pack 10; a pressure relief safety valve 11; an output positive electrode 12; an output negative electrode 13; a protective shell 2; a first shell 21; a boss 211; a blind hole 2111; an inclined surface 212; a second shell 22; a rib 221; a first buckle 23; a U-shaped buckle hole 231; a wedge-shaped buckle portion 232; a heat dissipation hole 24; an insertion hole 25; an anti-sway bracket 251; a second buckle 26; a second buckle portion 261; and a second buckle hole 262. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0030] The utility model provides a nickel-hydrogen battery module, which comprises a plurality of single cells 1 and a protective shell 2. The single cells 1 have a square metal shell, which can be made of metal materials resistant to alkaline solutions such as stainless steel and nickel-plated carbon steel. A pressure relief safety valve 11 is arranged on the top of the metal shell. The metal shell is the negative electrode of the single cell 1, and the positive electrode of the single cell 1 is insulated on the right side of the metal shell. The single cells 1 are connected in series in sequence to form a battery pack 10. Preferably, two adjacent single cells 1 are connected in series by welding the positive electrode of the previous single cell 1 to the metal shell of the next single cell 1 to reduce the contact resistance between the single cells 1 and improve the current capacity of the battery module. Furthermore, in order to improve the welding convenience and reliability between the single cells 1, the positive electrode of the single cell 1 is fixedly provided with a connecting flap (not shown in the drawings), and the connecting flap is welded to the metal shell.

[0031] The protective housing 2 includes a first housing 21 and a second housing 22 connected in a snap-fit ​​manner. The first housing 21 and the second housing 22 are connected by a plurality of first buckle members 23. Figure 3 As shown, the first fastening member 23 includes a U-shaped fastening hole 231 and a wedge-shaped convex buckle portion 232, the U-shaped fastening holes 231 are dispersedly arranged on the four sides of the second shell 22, the convex buckle portion is arranged on the first shell 21 and is opposite to the U-shaped fastening hole 231, and the first shell 21 and the second shell 22 are fastened to form a accommodating cavity of the battery pack 10, and the inner surfaces of the first shell 21 and the second shell 22 are provided with ribs 221, and after the first shell 21 and the second shell 22 are fastened, the ribs 221 conflict with the metal shell of the single battery 1 to further limit the movement of the single battery 1 and form a heat dissipation channel; preferably, the protective shell 2 is provided with through holes for the output positive electrode 12 and the output negative electrode 13 of the battery pack 10 to pass through, as shown in FIG. Figure 1 and 2 As shown, in this embodiment, the through holes are respectively arranged on the left side and the right side of the protective shell 2; preferably, as Figure 4As shown, the top of the protective shell 2 forms a housing cavity for the pressure relief safety valve 11 of the single battery 1 to limit the position of the single battery 1, and the housing cavity is provided with a protective cover protruding from the pressure relief safety valve 11, and air leakage holes are provided on both sides of the protective cover; bosses 211 are provided at both ends of the bottom of the first shell 21, and a blind hole 2111 is opened in at least one of the bosses 211, and an internal thread can be directly formed in the blind hole 2111, or a wire screw sleeve or a fixing nut can be nested, and a fixing bolt (not shown in the drawings) connected to the frame is screwed into the blind hole 2111 to completely isolate the fixing bolt from the interior of the protective shell 2 to prevent the formed charged condensed water from contacting the fixing bolt, thereby causing the frame to be charged and the battery module to consume electricity by itself, and the opposite side of the boss 211 is provided with an inclined surface 212 for guiding condensed water, so that the condensed water is easier to discharge, and the relative position of the second shell 22 to the boss 211 and the inclined surface 212 is set as a missing corner. Except for the missing corner position, the first shell 21 and the second shell 22 are symmetrical structures to each other.

[0032] Furthermore, a heat dissipation hole 24 is provided at the bottom of the protective shell 2, and the heat dissipation hole 24 is in a grille shape to provide a channel for external air to enter the protective shell 2 to achieve heat dissipation of the single battery 1. Compared with the traditional battery module, there is no need to additionally arrange a heat sink between the single battery cells 1. At the same time, the grille can provide better support for the single battery cells 1 and has the function of absorbing part of the vibration during actual use; the top and bottom of the protective shell 2 are also respectively provided with an insertion hole 25 for a temperature probe to facilitate the implementation of monitoring the temperature value of the top and bottom of the battery module. Preferably, the outside of the insertion hole 25 on the top of the protective shell 2 also protrudes with an anti-sway bracket 251 for the temperature probe to improve the stability of the temperature probe connection and the detection accuracy.

[0033] Further, the outer surface of the protective shell 2, that is, the outer surface of the first shell 21 and the second shell 22, is provided with a plurality of groups of second fastening members 26, the second fastening members 26 include a second convex buckle portion 261 and a second fastening hole 262, the second convex buckle portion 261 and the second fastening hole 262 are respectively provided on the first shell 21 and / or the second shell 22, the second convex buckle portion 261 is a cylindrical protrusion, a single-sided wedge-shaped protrusion or a combination of the two, and the second fastening hole 262 is a shape matching the convex buckle portion, preferably, as Figure 1 , 2As shown in FIGS. 5 and 6, the first shell 21 and the second shell 22 are both provided with the second convex buckle portion 261 and the second buckle hole 262, wherein the second convex buckle portion 261 on the first shell 21 includes two cylindrical protrusions and two unilateral wedge-shaped protrusions, and the second buckle hole 262 is symmetrically arranged with the second convex buckle portion 261. Correspondingly, the second shell 22 is also provided with the same number of second convex buckle portions 261 and second buckle holes 262, and the arrangement positions are matched with those of the first shell 21. Through the arrangement of the second buckle 26 in this form, the protective shells 2 of adjacent battery modules can be tightly and firmly connected, so that the battery modules have a more compact structure when forming a battery system, and the utilization rate of the frame space is improved; further, in order to avoid deformation of the protective shell when adjacent modules are buckled, the second convex buckle portion 261 and the second buckle hole 262 also form a protrusion inwardly on the inner surface of the first shell 21 and the second shell 22, and the protrusion conflicts with the metal shell of the single battery 1.

[0034] It should be noted that the bottom, top, left side and right side of the protective housing 2 described above are all formed by the side edges of the first housing 21 and the second housing 22 in corresponding positions after being buckled together.

[0035] In the description of the present invention, it should be noted that the terms "bottom", "top", "left", "right", etc. indicate orientations or positional relationships based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A nickel-hydrogen battery module, comprising a plurality of single cells, each of which has a square metal shell, and a pressure relief safety valve is provided at the top of the metal shell, characterized in that: The metal shell is the negative electrode of the single cell, and the positive electrode of the single cell is insulated and arranged on the right side of the metal shell. The single cells are arranged in a single row and connected in series to form a battery pack. A protective shell is arranged outside the battery pack, and the protective shell includes a first shell and a second shell connected in a snap-on manner. The first shell and the second shell are snapped together to form a accommodating cavity for the battery pack. Bosses are arranged at both ends of the bottom of the first shell, and at least one of the bosses is provided with a blind hole, and a fixing bolt connected to the frame is screwed into the blind hole. Inclined surfaces are arranged on the opposite sides of the bosses, and the position of the second shell relative to the boss and the inclined surface is set as a missing corner. Except for the missing corner position, the first shell and the second shell are symmetrical structures.

2. A nickel-metal hydride battery module according to claim 1, characterized in that: The series connection of the single cells is that the positive electrode of the preceding single cell is welded and fixed to the metal shell of the succeeding single cell to form a series connection.

3. A nickel-metal hydride battery module according to claim 1, characterized in that: The protective shell is provided with a plurality of first buckling parts, the first buckling parts include U-shaped buckling holes and wedge-shaped convex buckles, the U-shaped buckling holes are dispersedly arranged on the four sides of the second shell, and the convex buckles are arranged on the first shell and opposite to the U-shaped buckling holes.

4. A nickel-metal hydride battery module according to claim 1, characterized in that: The bottom of the protective shell is provided with heat dissipation holes, which are in a grid shape.

5. The nickel-metal hydride battery module according to claim 1, characterized in that: The inner surfaces of the first shell and the second shell are both provided with ribs, and after the first shell and the second shell are buckled together, the ribs abut against the single battery.

6. A nickel-metal hydride battery module according to claim 1, characterized in that: The top and bottom of the protective shell are respectively provided with insertion holes for the temperature sensing probe.

7. A nickel-metal hydride battery module according to claim 6, characterized in that: An anti-sway bracket with a temperature sensing probe protrudes from the outside of the insertion hole at the top of the protective shell.

8. The nickel-metal hydride battery module according to claim 1, characterized in that: The outer surface of the protective shell is provided with a plurality of groups of second fastening members, the second fastening members include a second convex buckle portion and a second fastening hole, and the second convex buckle portion and the second fastening hole are respectively provided on the first shell and / or the second shell.

9. A nickel-metal hydride battery module according to claim 8, characterized in that: The first shell and the second shell are provided with the second convex buckle parts and the second buckle holes at the same time, and the number of the second convex buckle parts and the second buckle holes are the same and symmetrically distributed.

10. The nickel-metal hydride battery module according to claim 8, characterized in that: The second convex buckle portion is a cylindrical protrusion, a single-sided wedge-shaped protrusion or a combination of the two, and the second buckling hole is a shape that matches the convex buckle portion.

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