Lithium battery pack structure

Abstract

The utility model provides a lithium battery pack structure. The lithium battery pack structure comprises a shell, a cover plate and a plurality of battery cell monomers, the plurality of battery cell monomers are arranged in the shell, and the cover plate covers the end surface of the top of the shell; the shell comprises a shell body, a first side plate, a second side plate, a protection plate and a plurality of cavity units arranged in the shell body, the battery cell monomers are arranged in the cavity units, and the battery cell monomers and the cavity units are arranged in a one-to-one correspondence manner; the first side plate is arranged on the end face of one end of the shell body, and the second side plate is arranged on the end face of the other end of the shell body; a first gap is arranged between the first side plate and the shell body, and the protection plate is arranged in the first gap. The structure is simple, the preparation cost is low, the size is small, the sealing performance is good, the energy density of the battery is high, pollution is avoided, and the battery is environmentally friendly and can be suitable for large-capacity and large-size battery structures.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a lithium battery pack structure. Background Art

[0002] For lead-acid batteries, lead is very harmful to the human body, and even a trace of lead can pose a serious threat to human health; waste lead-acid batteries have excessive lead content, and improper handling will cause serious environmental pollution and endanger people's health. In addition, existing lead-acid products have defects such as low energy density, short cycle times, low discharge rate, and heavy weight, and lead-acid batteries have been restricted in production and use.

[0003] The structure of lithium batteries is compatible with that of lead-acid batteries and can be directly used in place of each other. At present, whether it is a soft-pack battery, a cylindrical battery, or a square-shell battery, lithium-ion / sodium-ion batteries are basically produced as single units; if they need to be used in specific occasions, a PACK production line needs to be established, and then the PACK is assembled and used as required, which requires a large investment in site, materials, and manpower; if a battery is broken, it requires very professional staff to repair and replace the battery, and the cost and threshold of use are high.

[0004] In addition, most power battery shells are formed by stretching aluminum alloy. In order to increase energy density, the aluminum shell of the battery is very thin. If the positive and negative electrodes of a battery accidentally touch the battery shell of another battery to cause a short circuit, the shell of the other battery will be violently discharged by the short-circuited battery, which can easily ignite the free electrolyte inside the battery and cause a fire. Utility Model Content

[0005] The utility model provides a lithium battery pack structure, aiming to solve the problems of thin shell structure of traditional lithium battery single cell and high safety risk of the battery.

[0006] To achieve the above-mentioned purpose, the embodiment of the utility model provides a lithium battery pack structure, comprising a shell, a cover plate and a plurality of battery cells; the plurality of battery cells are arranged in the shell, and the cover plate is covered on the end surface of the top of the shell;

[0007] The shell includes a shell body, a first side plate, a second side plate, a protective plate and a plurality of cavity units arranged in the shell body, the battery cell monomers are arranged in the cavity units, and the battery cell monomers and the cavity units are arranged one by one; the first side plate is arranged on the end surface of one end of the shell body, and the second side plate is arranged on the end surface of the other end of the shell body; a first gap is arranged between the first side plate and the shell body, and the protective plate is arranged in the first gap.

[0008] As a preferred embodiment, several of the battery cells are connected in series; two adjacent battery cells are connected in series via a pole connector; among the battery cells connected in series, the battery cells at both ends are connected to the terminals via a positive pole and a negative pole, respectively.

[0009] As a preferred embodiment, the positive electrode column, the negative electrode column and the terminal are arranged close to the first side plate; one end of the positive electrode column is fixed to the protection plate through an insulating fixing seat,

[0010] As a preferred embodiment, the terminal includes a positive terminal, a first negative terminal and a second negative terminal which are independently arranged; one end of the positive terminal is connected to the positive electrode column, and the other end is extended outward from the first slot of the cover plate;

[0011] One end of the first negative terminal is connected to the negative pole, and the other end is fixed to the protection plate by a first screw; one end of the second negative terminal is fixed to the protection plate by a second screw, and the other end is extended outward from the second slot of the cover plate.

[0012] As a preferred embodiment, the positive electrode column and the negative electrode column are respectively sealed and connected to the shell body via radial compression sealing rings.

[0013] As a preferred embodiment, a collection line fixing seat is provided on the protection plate; a plurality of collection lines are also provided in the shell body; one end of each of the collection lines is fixed on the collection line fixing seat, and the other end is connected to the collection terminal of the corresponding battery cell; the collection lines are arranged in a one-to-one correspondence with the battery cell.

[0014] As a preferred embodiment, the first side plate and the second side plate are symmetrically arranged; and a second gap is arranged between the second side plate and the shell body.

[0015] As a preferred embodiment, wall panels are provided between adjacent cavity units; the wall panels are respectively in contact with the bottom surface of the shell body and the side surfaces of the shell body.

[0016] As a preferred embodiment, the cover plate is provided with an explosion-proof valve and a liquid injection hole which are independent of each other; the explosion-proof valve and the liquid injection hole are arranged in a one-to-one correspondence with the cavity unit; and the liquid injection hole is arranged close to the second side plate.

[0017] As a preferred embodiment, the shell is a plastic shell; the cover plate is a plastic cover plate; and the cover plate is connected to the shell by ultrasound.

[0018] As a preferred embodiment, the battery cell is a lithium-ion battery cell.

[0019] The structure of the present application has the advantages of small size, large capacity, light weight and high energy density. Multiple cavity units are set in the shell through the wall plate, which effectively increases the strength of the shell in the thickness direction, so that the battery can withstand greater expansion force and is not easy to deform. In addition, it can be used for assembly without the need for additional PACK design and assembly, saving PACK costs and time. The structure of the present application is simple, the preparation cost is low, the volume is small, the sealing is good, the energy density of the battery is high, there is no pollution, it is environmentally friendly, and it can be applied to large-capacity and large-size battery structures. The structure of the present application does not need to be PACK grouped, and can directly replace lead-acid batteries, which greatly facilitates customer installation and use. There is no need to establish a separate PACK production line, saving space, materials and manpower. Through the structure of the present application, the voltage and temperature of each battery cell can be accurately detected and collected, and the overcharge and over-discharge currents can be cut off in time. The performance is no different from that of a pack assembled battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of a lithium battery pack structure according to an embodiment of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the exploded structure of a lithium battery pack structure;

[0023] Figure 3 for Figure 1 A schematic structural diagram of a shell of a lithium battery pack structure;

[0024] Figure 4 for Figure 3 A schematic structural diagram of the shell from another angle. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] Specifically, Figures 1 to 4 As shown, the embodiment of the utility model provides a lithium battery pack structure, including a shell 10, a cover plate 20 and a plurality of battery cells 30; the plurality of battery cells 30 are arranged in the shell 10, and the cover plate 20 is covered on the end surface of the top of the shell 10;

[0031] The shell 10 includes a shell body 11, a first side plate 12, a second side plate 13, a protective plate 14 and a plurality of cavity units 15 arranged in the shell body 11, the battery cell monomer 30 is arranged in the cavity unit 15, and the battery cell monomer 30 is arranged in a one-to-one correspondence with the cavity unit 15; the first side plate 12 is arranged on the end surface of one end of the shell body 11, and the second side plate 13 is arranged on the end surface of the other end of the shell body 11; a first gap is arranged between the first side plate 12 and the shell body 11, and the protective plate 14 is arranged in the first gap.

[0032] As a preferred embodiment, several of the battery cells 30 are connected in series; two adjacent battery cells 30 are connected in series through a pole connector (not marked in the figure); among the battery cells 30 connected in series, the battery cells 30 at both ends are connected to the terminal 60 through the positive pole 40 and the negative pole 50 respectively.

[0033] As a preferred embodiment, the positive electrode column 40, the negative electrode column 50 and the terminal 60 are arranged close to the first side plate 12; one end of the positive electrode column 40 is fixed to the protection plate 14 through an insulating fixing seat (not marked in the figure),

[0034] As a preferred embodiment, the terminal 60 includes a positive terminal 61, a first negative terminal 62 and a second negative terminal 63 which are independently arranged; one end of the positive terminal 61 is connected to the positive electrode column 40, and the other end is extended outward from the first slot 21 of the cover plate 20;

[0035] One end of the first negative terminal 62 is connected to the negative pole 50 , and the other end is fixed to the protection plate 14 by a first screw 621 ; one end of the second negative terminal 63 is fixed to the protection plate 14 by a second screw 631 , and the other end is extended outward from the second slot 22 of the cover plate 20 .

[0036] As a preferred embodiment, the positive electrode column 40 and the negative electrode column 50 are respectively sealed and connected to the shell body 11 through radial compression sealing rings (not marked in the figure).

[0037] As a preferred embodiment, a collection line fixing seat 141 is provided on the protection plate 14; a plurality of collection lines 70 are also provided in the shell body 11; one end of each collection line 70 is fixed on the collection line fixing seat 141, and the other end is connected to the collection terminal 31 of the matched battery cell 30; the collection lines 70 are arranged one by one with the battery cell 30. Through the collection lines, the state of each battery cell can be well detected, which is conducive to better performance of the battery, and the battery cell with problems can be replaced separately through detection, saving costs.

[0038] As a preferred embodiment, the first side plate 12 and the second side plate 13 are symmetrically arranged; a second gap is arranged between the second side plate 13 and the shell body 11 .

[0039] As a preferred embodiment, a wall plate 16 is disposed between adjacent cavity units 15 ; the wall plate 16 abuts against the bottom surface of the shell body 11 and the side surface of the shell body 11 , respectively.

[0040] As a preferred embodiment, the cover plate 20 is provided with an explosion-proof valve 23 and a liquid injection hole 24 which are independent of each other; the explosion-proof valve 23 and the liquid injection hole 24 are arranged in one-to-one correspondence with the cavity unit 30; and the liquid injection hole 24 is arranged close to the second side plate 13.

[0041] As a preferred embodiment, the housing 10 is a plastic housing; the cover plate 20 is a plastic cover plate; the cover plate 20 is ultrasonically connected to the housing 10. The use of ultrasound to achieve the connection between the housing and the cover plate can more effectively seal the electrolyte, effectively prevent leakage, and is simple and convenient to operate.

[0042] As a preferred embodiment, the battery cell 30 is a lithium-ion battery cell.

[0043] The structure of the present application has the advantages of small size, large capacity, light weight and high energy density. Multiple cavity units are set in the shell through the wall plate, which effectively increases the strength of the shell in the thickness direction, so that the battery can withstand greater expansion force and is not easy to deform. In addition, it can be used for assembly without the need for additional PACK design and assembly, saving PACK costs and time. The structure of the present application is simple, the preparation cost is low, the volume is small, the sealing is good, the energy density of the battery is high, there is no pollution, it is environmentally friendly, and it can be applied to large-capacity and large-size battery structures. The structure of the present application does not need to be PACK grouped, and can directly replace lead-acid batteries, which greatly facilitates customer installation and use. There is no need to establish a separate PACK production line, saving space, materials and manpower. Through the structure of the present application, the voltage and temperature of each battery cell can be accurately detected and collected, and the overcharge and over-discharge currents can be cut off in time. The performance is no different from that of a pack assembled battery pack.

[0044] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0045] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery pack structure, characterized in that: It comprises a shell, a cover plate and a plurality of battery cells; the plurality of battery cells are arranged in the shell, and the cover plate is covered on the end surface of the top of the shell; The shell includes a shell body, a first side plate, a second side plate, a protective plate and a plurality of cavity units arranged in the shell body, the battery cell monomers are arranged in the cavity units, and the battery cell monomers and the cavity units are arranged one by one; the first side plate is arranged on the end surface of one end of the shell body, and the second side plate is arranged on the end surface of the other end of the shell body; a first gap is arranged between the first side plate and the shell body, and the protective plate is arranged in the first gap.

2. The lithium battery pack structure according to claim 1, characterized in that: Several of the battery cells are connected in series; two adjacent battery cells are connected in series via a pole connector; among the battery cells connected in series, the battery cells at both ends are connected to the terminals via a positive pole and a negative pole, respectively.

3. The lithium battery pack structure according to claim 2, characterized in that: The positive pole, the negative pole and the terminal are arranged close to the first side plate; one end of the positive pole is fixed to the protection plate through an insulating fixing seat.

4. The lithium battery pack structure according to claim 3, characterized in that: The terminal comprises a positive terminal, a first negative terminal and a second negative terminal which are independently arranged; one end of the positive terminal is connected to the positive pole, and the other end is extended outward from the first slot of the cover plate; One end of the first negative terminal is connected to the negative pole, and the other end is fixed to the protection plate by a first screw; one end of the second negative terminal is fixed to the protection plate by a second screw, and the other end is extended outward from the second slot of the cover plate.

5. The lithium battery pack structure according to claim 4, characterized in that: The positive pole and the negative pole are respectively sealed and connected to the shell body through radial compression sealing rings.

6. The lithium battery pack structure according to claim 1, characterized in that: The protection plate is provided with a collection line fixing seat; a plurality of collection lines are also provided in the shell body; one end of each of the collection lines is fixed on the collection line fixing seat, and the other end is connected to the collection terminal of the corresponding battery cell; the collection lines are provided in one-to-one correspondence with the battery cell.

7. The lithium battery pack structure according to claim 1, characterized in that: The first side plate and the second side plate are symmetrically arranged; a second gap is arranged between the second side plate and the shell body.

8. The lithium battery pack structure according to claim 1, characterized in that: Wall plates are arranged between adjacent cavity units; the wall plates are respectively in contact with the bottom surface of the shell body and the side surface of the shell body.

9. The lithium battery pack structure according to claim 1, characterized in that: The cover plate is provided with an explosion-proof valve and a liquid injection hole which are independent of each other; the explosion-proof valve and the liquid injection hole are arranged in a one-to-one correspondence with the cavity unit; and the liquid injection hole is arranged close to the second side plate.

10. The lithium battery pack structure according to claim 1, characterized in that: The shell is a plastic shell; the cover is a plastic cover; the cover is connected to the shell by ultrasound; and the battery cell is a lithium-ion battery cell.

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