Battery box of PACK battery pack

Abstract

The invention discloses a battery box of a PACK battery pack in the technical field of battery boxes, and the battery box comprises a battery body and a box body, the box body comprises two groups of battery mounting seats, a lower shell, a middle shell and an upper shell, and the battery mounting seats are used for accommodating a plurality of groups of accommodating grooves of the battery body; the battery box solves the problems that heat conduction between single batteries in an existing battery box is fast, when the single batteries are damaged, the temperature is rapidly increased and even the single batteries are burnt, other batteries in a battery pack are rapidly influenced, and the battery pack is not damaged, so that the service life of the battery pack is prolonged. The problems that when a single battery is in thermal runaway, high-temperature gas sprayed out of a battery cell explosion-proof valve of the single battery is inconvenient to discharge out of a battery box in time, and when the sprayed high-temperature gas is directly released into the battery box, the probability is high, short circuit of other batteries is caused, and the battery pack is damaged again are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery boxes, and in particular to a battery box of a PACK battery pack. Background Art

[0002] PACK battery pack, or Power Assemble Kit, is an integrated system used to store and provide electrical energy in electric vehicles (EVs) and other electric devices. It is usually composed of multiple battery cells (cells), which are connected in series and in parallel to provide the required voltage and capacity. When multiple groups of PACK battery packs are used in combination, the PACK battery packs need to be placed in a battery box for assembly and installation, and then connected through wires so that the multiple groups of PACK battery packs can work together.

[0003] The heat conduction between the individual batteries inside the existing battery box is relatively fast. When a single battery is damaged and the temperature increases rapidly or even burns, it will quickly affect the other batteries in the battery pack, thereby reducing the safety of the actual use of the battery pack. In addition, when a single battery has thermal runaway, the high-temperature gas ejected from its battery cell explosion-proof valve is inconvenient to be discharged from the battery box in time. When the ejected high-temperature gas is directly released into the interior of the battery box, there is a high probability that it will cause a short circuit in other batteries and cause the battery pack to be damaged again. Therefore, those skilled in the art provide a battery box for a PACK battery pack to solve the problems raised in the above background technology. Summary of the invention

[0004] The object of the present invention is to provide a battery box for a PACK battery pack to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a battery box of a PACK battery pack, comprising a battery body and a box body, wherein the box body comprises:

[0006] A battery mounting seat, wherein the battery mounting seat is provided with two groups, wherein the battery mounting seat is provided with multiple groups of receiving grooves for placing the battery body, and the battery body is fixedly connected to the battery mounting seat by bolts;

[0007] A lower shell, the top of which is fixedly connected to the battery mounting seat by bolts;

[0008] A middle shell, the bottom end of which is in contact with the top of the lower shell, two groups of heat dissipation components are symmetrically installed inside the middle shell, multiple groups of heat dissipation fins for inserting into the side of the battery body are installed on the heat dissipation components, multiple groups of air injection holes connected to the internal cavity of the heat dissipation fins are opened on the side of the middle shell, and the outer ring of the explosion-proof valve of each group of the battery body is sleeved with a one-way exhaust component connected to the inner cavity of the corresponding heat dissipation fin;

[0009] The upper shell has a bottom that abuts against a top of the middle shell, and the lower shell, the middle shell and the upper shell are assembled by a second fixing member arranged on the outer ring.

[0010] Preferably, a first sealing ring for abutting against a bottom end of the middle shell is bonded to the top of the lower shell, and a sealing gasket for abutting against a top end of the middle shell is bonded to the bottom of the upper shell.

[0011] Preferably: the second fixing member includes multiple groups of positioning rods welded to the outer ring of the lower shell, the outer ring of the middle shell is welded with positioning rings slidably mounted on the multiple groups of positioning rods, the bottom of the upper shell is welded with multiple groups of sleeves correspondingly mounted on each group of positioning rods, and the top end of each group of positioning rods is threadedly connected with a locking nut that tightens the upper shell.

[0012] Preferably: the heat dissipation assembly includes multiple groups of support plates welded on one side of the inner cavity of the middle shell, cooling elbows are fixedly installed in the multiple groups of support plates, one end of the cooling elbow extending to the outside of the middle shell is connected to a liquid inlet, and the other end of the cooling elbow extending to the outside of the middle shell is connected to a liquid outlet, each group of the support plates is integrally formed with a heat sink close to the side of the battery body, and the jet holes connected to the inner cavity of the heat sink pass through the support plates.

[0013] Preferably: the one-way exhaust assembly includes a vent pipe with one end connected to the inner cavity of the heat sink, the other end of the vent pipe is welded to or suspended in the air with another group of heat sinks, the bottom of the vent pipe is connected to a sealing cover arranged outside the explosion-proof valve on the battery body, and the inside of the vent pipe is provided with a one-way valve for guiding the gas in the sealing cover to the heat sink.

[0014] Preferably: the one-way valve includes a support ring fixedly installed inside the ventilation pipe, two sets of connecting rods are slidably installed inside the support ring, a connecting ring is welded to the end of the connecting rod close to the sealing cover, and a baffle for covering the central circular hole of the support ring is welded to the end of the connecting rod away from the sealing cover, and a spring is installed between the connecting ring and the inner wall of the ventilation pipe.

[0015] Preferably, a second sealing ring abutting against the top surface of the battery body is bonded to the bottom end of the sealing cover.

[0016] Preferably, the bottom and side surfaces of the battery mounting seat are provided with a plurality of heat dissipation grooves.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, two groups of heat dissipation components corresponding to the battery modules are symmetrically arranged inside the middle shell, and the internal hollow heat sinks connected to the heat dissipation components are inserted between or on the sides of each battery body. The cooling elbow, the support sheet and the heat sink cooperate to realize efficient heat dissipation of the battery module. The heat sink separates adjacent battery bodies, which can effectively block the heat conduction between the battery bodies and prevent the fire from spreading rapidly to other batteries and causing an explosion when one battery spontaneously ignites. This can buy a certain amount of self-rescue time for the internal personnel of the vehicle using the battery box, improve the safety of the actual use of the battery box, and the heat sink inserted between the battery bodies is also conducive to further improving the stability of the positioning of the battery module.

[0019] 2. In the present invention, the heat sink is connected to the outside of the battery box through multiple groups of air jet holes. When the middle shell drives the heat sink connected to the heat dissipation assembly and the one-way exhaust assembly to be assembled, the one-way exhaust assembly is buckled to the outside of the corresponding battery explosion-proof valve. When the internal pressure of the battery is too large and high-temperature gas is discharged to the outside through the explosion-proof valve, the high-temperature gas can be quickly dredged to the heat sink through the vent pipe, the sealing cover and the one-way valve. The gas inside the heat sink is discharged to the outside of the battery box through the air jet holes, which can effectively prevent the gas discharged from the explosion-proof valve from affecting other components inside the battery box, thereby reducing the possibility of explosion of the battery box and further improving the safety of the battery module.

[0020] 3. In the present invention, the battery body is assembled by setting a battery mounting seat, the battery mounting seat is placed on the lower shell, and the positioning rod, positioning ring, sleeve and locking nut are used to realize rapid assembly of the battery box, and the pressure rod provided on the upper shell can firmly confine the battery body and the battery mounting seat to the inside of the battery box. At the same time, structures such as the positioning rod, positioning ring and sleeve can conveniently improve the overall supporting strength of the battery box. Further, a first sealing ring and a sealing gasket are provided to improve the sealing of the battery box after assembly, thereby ensuring the efficient waterproof and dustproof effect of the battery box. The first sealing ring, sealing gasket and second sealing ring on the device can also provide a certain shock absorption effect for the overall structure of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a first schematic diagram of the overall structure of the present invention;

[0023] Figure 3 A second schematic diagram showing the disassembly of the overall structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the assembly of the middle shell and the lower shell and other structures of the present invention;

[0025] Figure 5A bottom view of the middle shell and its connection structure of the present invention;

[0026] Figure 6 It is a cross-sectional view of the middle shell and its connection structure of the present invention;

[0027] Figure 7 For the present invention Figure 6 A is an enlarged view of the middle image.

[0028] Legend:

[0029] 10. Battery body; 20. Box; 201. Battery mounting seat; 202. Lower housing; 203. Middle housing; 204. Upper housing;

[0030] 30. One-way exhaust assembly; 301. Ventilation pipe; 302. Sealing cover; 303. One-way valve; 3031. Support ring; 3032. Connecting rod; 3033. Connecting ring; 3034. Blocking piece; 3035. Spring;

[0031] 40, heat dissipation component; 401, support plate; 402, cooling elbow; 403, liquid inlet; 404, liquid outlet;

[0032] 60, second fixing member; 601, positioning rod; 602, positioning ring; 603, sleeve; 604, locking nut;

[0033] 11. heat sink; 12. first sealing ring; 13. sealing gasket; 14. air jet hole; 15. second sealing ring; 17. heat sink. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 to Figure 7In the embodiment of the present invention, the case 20 includes a battery body 10 and a box body 20. The box body 20 includes a battery mounting seat 201, a lower shell 202, a middle shell 203 and an upper shell 204. The battery mounting seat 201 is provided with two groups. The battery mounting seat 201 has multiple groups of accommodating grooves for placing the battery body 10. The battery body 10 is fixedly connected with the battery mounting seat 201 provided inside by bolts. The top of the lower shell 202 is fixedly connected with the battery mounting seat 201 by bolts. The bottom end of the middle shell 203 abuts against the top of the lower shell 202. The middle shell 203 is fixedly connected with the battery mounting seat 201 by bolts. Two groups of heat dissipation components 40 are symmetrically installed inside 03, and multiple groups of heat dissipation fins 11 for being inserted into the side of the battery body 10 are installed on the heat dissipation components 40. Multiple groups of air injection holes 14 connected to the internal cavity of the heat dissipation fins 11 are opened on the side of the middle shell 203. The outer ring of the explosion-proof valve of each group of battery bodies 10 is sleeved with a one-way exhaust component 30 connected to the inner cavity of the corresponding heat dissipation fins 11. The bottom of the upper shell 204 is abutted against the top of the middle shell 203, and the lower shell 202, the middle shell 203 and the upper shell 204 are assembled through the second fixing piece 60 set on the outer ring.

[0036] When the battery box of the PACK battery pack is assembled and used, the battery bodies 10 to be used in combination are installed one by one into the battery mounting seat 201. After the battery bodies 10 inside the battery mounting seat 201 are assembled, they are installed on the lower shell 202. The middle shell 203 is firmly buckled on the lower shell 202 from top to bottom by using the second fixing member 60. When the middle shell 203 is assembled, the heat sink 11 connected to the heat dissipation component 40 can be inserted between and outside the battery bodies 10. The heat dissipation component 40 and the heat sink 11 can provide efficient heat dissipation for the battery module. At the same time, the heat sink 11 separates adjacent battery bodies 10, which can effectively block the electric The rapid conduction of heat between the battery bodies 10 can also have a corresponding flame retardant effect. The one-way exhaust component 30 connected to the inner cavity of the heat sink 11 can be buckled onto the corresponding explosion-proof valve of the battery body 10. When the internal pressure of the battery is too large, the explosion-proof valve opens to discharge the high-temperature gas directly into the heat sink 11 through the one-way exhaust component 30. The inner cavity of the heat sink 11 is connected to the outside of the battery box through multiple groups of jet holes 14, which can effectively prevent the gas discharged from the explosion-proof valve from affecting other components inside the battery box. After the lines in the middle shell 203 are all laid and connected, the upper shell 204 is fixed to the top of the middle shell 203 using the second fixing member 60 to achieve the sealing of the battery box.

[0037] See also Figure 1 to Figure 5Furthermore, a first sealing ring 12 for abutting against the bottom end of the middle shell 203 is bonded to the top of the lower shell 202, and a sealing gasket 13 for abutting against the top end of the middle shell 203 is bonded to the bottom of the upper shell 204. The first sealing ring 12 and the sealing gasket 13 can effectively improve the sealing of the battery box during use, thereby ensuring the efficient dustproof and waterproof effect of the device. The sealing ring can be made of rubber and other materials, which is also conducive to improving the tightness of the device after assembly.

[0038] In one embodiment, see Figure 1 to Figure 6 Specifically, the second fixing member 60 includes multiple groups of positioning rods 601 welded at the outer ring of the lower shell 202, the outer ring of the middle shell 203 is welded with a positioning ring 602 slidably mounted on the multiple groups of positioning rods 601, and the bottom of the upper shell 204 is welded with multiple groups of sleeves 603 correspondingly mounted on each group of positioning rods 601. The top of each group of positioning rods 601 is threadedly connected with a locking nut 604 that presses the upper shell 204. After the components on the lower shell 202 are assembled, the middle shell 203 is snapped onto the lower shell 202, and the positioning ring 602 is slidably mounted on the multiple groups of positioning rods 601. At the end of the battery box assembly, the sleeve 603 on the upper shell 204 is slidably mounted on the top of the positioning rod 601, and the locking nut 604 is finally tightened to the top of the positioning rod 601 through a threaded connection, which facilitates the rapid assembly and disassembly of the battery box and helps to improve the overall supporting strength of the battery box.

[0039] Correspondingly, the heat dissipation assembly 40 includes a plurality of groups of support sheets 401 welded on one side of the inner cavity of the middle shell 203, and a cooling elbow 402 is fixedly installed in the plurality of groups of support sheets 401. One end of the cooling elbow 402 extending to the outside of the middle shell 203 is connected to a liquid inlet 403, and the other end of the cooling elbow 402 extending to the outside of the middle shell 203 is connected to a liquid outlet 404. Each group of support sheets 401 is integrally formed with a heat sink 11 close to the side of the battery body 10, and an air injection hole 14 connected to the inner cavity of the heat sink 11 passes through the support sheet 401. The cooling elbow 402 is connected to an external refrigeration device through the liquid inlet 403 and the liquid outlet 404. Coolant circulates inside the cooling elbow 402. The heat sink 11 and the support sheet 401 on the cooling elbow 402 facilitate heat conduction and heat dissipation of the battery. Both the heat sink 11 and the support sheet 401 can be made of materials with good thermal conductivity. The connection and operation methods between the components are all existing technologies and will not be described in detail here.

[0040] In one embodiment, see Figure 1 to Figure 7Specifically, the one-way exhaust component 30 includes a vent pipe 301 whose one end is connected to the inner cavity of the heat sink 11, and the other end of the vent pipe 301 is welded to or suspended with another group of heat sinks 11, and the bottom of the vent pipe 301 is connected to a sealing cover 302 that is arranged on the outside of the explosion-proof valve on the battery body 10, and the inside of the vent pipe 301 is provided with a one-way valve 303 that guides the gas in the sealing cover 302 to the heat sink 11, and the one-way valve 303 includes a support ring 3031 fixedly installed inside the vent pipe 301, and two groups of connecting rods 3032 are slidably installed inside the support ring 3031, and a connecting ring 3033 is welded to one end of the connecting rod 3032 close to the sealing cover 302, and a blocking piece 3034 for covering the central circular hole of the support ring 3031 is welded to one end of the connecting rod 3032 away from the sealing cover 302, and a spring 3035 is installed between the connecting ring 3033 and the inner wall of the vent pipe 301.

[0041] The one-way exhaust assembly 30 can be installed along with the middle shell 203 and buckled onto the corresponding battery body 10. The sealing cover 302 covers the battery explosion-proof valve. A group of one-way exhaust assemblies 30 are connected to a group of corresponding heat sinks 11. When the explosion-proof valve is venting the pressure, the high-temperature gas can impact the baffle 3034 inside the ventilation pipe 301 to move. The central circular hole of the support ring 3031 is opened to allow the high-temperature gas to quickly flow to the corresponding heat sink 11. When the baffle 3034 moves, the connecting ring 3033 can be driven to move by the connecting rod 3032. The connecting ring 3033 drives the spring 3035 to expand and contract. When the one-way exhaust assembly 30 is closed, the spring 3035 pulls the baffle 3034 to tightly abut against the support ring 3031 through elastic force, which can prevent external air from flowing into the interior of the battery box during daily use.

[0042] The bottom end of the sealing cover 302 is bonded with a second sealing ring 15 that abuts against the top surface of the battery body 10, which can improve the sealing between the sealing cover 302 and the battery body 10 and effectively prevent the overflow of high-temperature gas output by the explosion-proof valve. The bottom and sides of the battery mounting seat 201 are provided with multiple groups of heat dissipation grooves 17, which can further enhance the heat dissipation effect of the battery module inside the battery box. The first sealing ring 12, the sealing pad 13 and the second sealing ring 15 can all be made of rubber materials, etc., which can be beneficial to improving the actual shock absorption effect of the overall structure inside the battery box.

[0043] The contents not described in detail in this specification belong to the prior art known to professionals in this field.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery box for a PACK battery pack, comprising a battery body (10) and a box body (20), characterized in that: The box (20) comprises: A battery mounting seat (201), wherein the battery mounting seat (201) is provided with two groups, wherein the battery mounting seat (201) is provided with a plurality of groups of receiving grooves for placing a battery body (10), and the battery body (10) is fixedly connected to the battery mounting seat (201) by means of bolts; A lower shell (202), the top of the lower shell (202) being fixedly connected to the battery mounting seat (201) via bolts; A middle shell (203), the bottom end of the middle shell (203) abutting against the top of the lower shell (202), two groups of heat dissipation components (40) being symmetrically mounted inside the middle shell (203), multiple groups of heat dissipation fins (11) being mounted on the heat dissipation components (40) for being inserted into the side of the battery body (10), multiple groups of air injection holes (14) being arranged on the side of the middle shell (203) and being connected to the internal cavity of the heat dissipation fins (11), and the outer ring of the explosion-proof valve of each group of the battery body (10) being sleeved with a one-way exhaust component (30) being connected to the inner cavity of the corresponding heat dissipation fin (11); An upper shell (204), wherein the bottom of the upper shell (204) abuts against the top of the middle shell (203), and the lower shell (202), the middle shell (203) and the upper shell (204) are assembled via a second fixing member (60) arranged on the outer ring.

2. The battery box of a PACK battery pack according to claim 1, characterized in that: The top of the lower shell (202) is bonded with a first sealing ring (12) for abutting against the bottom end of the middle shell (203), and the bottom of the upper shell (204) is bonded with a sealing gasket (13) for abutting against the top end of the middle shell (203).

3. The battery box of a PACK battery pack according to claim 2, characterized in that: The second fixing member (60) comprises a plurality of groups of positioning rods (601) welded to the outer ring of the lower shell (202); the outer ring of the middle shell (203) is welded with a positioning ring (602) slidably mounted on the plurality of groups of positioning rods (601); the bottom of the upper shell (204) is welded with a plurality of groups of sleeves (603) correspondingly mounted on each group of positioning rods (601); the top end of each group of positioning rods (601) is threadedly connected with a locking nut (604) for pressing the upper shell (204).

4. The battery box of a PACK battery pack according to claim 1, characterized in that: The heat dissipation assembly (40) comprises a plurality of groups of support sheets (401) welded to one side of the inner cavity of the middle shell (203), a cooling elbow (402) being fixedly installed in the plurality of groups of support sheets (401), one end of the cooling elbow (402) extending to the outside of the middle shell (203) being connected to a liquid inlet (403), and the other end of the cooling elbow (402) extending to the outside of the middle shell (203) being connected to a liquid outlet (404), each group of support sheets (401) being integrally formed with a heat dissipation sheet (11) close to the side of the battery body (10), and an air injection hole (14) connected to the inner cavity of the heat dissipation sheet (11) penetrating the support sheet (401).

5. The battery box of a PACK battery pack according to claim 4, characterized in that: The one-way exhaust assembly (30) comprises a vent pipe (301) having one end connected to the inner cavity of the heat sink (11); the other end of the vent pipe (301) is welded to or suspended in the air with another group of heat sinks (11); the bottom of the vent pipe (301) is connected to a sealing cover (302) arranged outside the explosion-proof valve on the battery body (10); and a one-way valve (303) is arranged inside the vent pipe (301) for guiding the gas in the sealing cover (302) to the heat sink (11).

6. The battery box of a PACK battery pack according to claim 5, characterized in that: The one-way valve (303) comprises a support ring (3031) fixedly mounted inside the ventilation pipe (301), two groups of connecting rods (3032) being slidably mounted inside the support ring (3031), a connecting ring (3033) being welded to one end of the connecting rod (3032) close to the sealing cover (302), and a blocking piece (3034) for shielding the central circular hole of the support ring (3031) being welded to one end of the connecting rod (3032) away from the sealing cover (302), and a spring (3035) being mounted between the connecting ring (3033) and the inner wall of the ventilation pipe (301).

7. The battery box of a PACK battery pack according to claim 5, characterized in that: A second sealing ring (15) is bonded to the bottom end of the sealing cover (302) and abuts against the top surface of the battery body (10).

8. The battery box of a PACK battery pack according to claim 7, characterized in that: The bottom and side surfaces of the battery mounting seat (201) are provided with multiple groups of heat dissipation grooves (17).

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