Multi-cavity battery pack structure

Abstract

The present application provides a multi-cavity battery pack structure, comprising a housing, a cover plate, and a plurality of battery cell units. The battery cell units are arranged in the housing, and the cover plate covers the end face of one end of the housing. The housing comprises a housing body and a plurality of cavity units arranged in the housing body, a wall plate is provided between every two adjacent cavity units, and the wall plate respectively abuts against the bottom surface of the housing body and the side surfaces of the housing body; and a first boss is provided at one end of the side of each cavity unit close to the cover plate, and a second boss is arranged at the other end thereof. Each battery cell unit is arranged in the corresponding cavity unit, and the battery cell unit is arranged between the first boss and the second boss; the battery cell units and the cavity units are arranged in a one-to-one correspondence manner; the second bosses are pairwise communicated with each other; and the first bosses located in the middle are pairwise communicated with each other, and the first bosses located at the two ends are independently arranged. The present application achieves low costs and environmental friendliness.

Description

A multi-cavity battery pack structure Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a multi-cavity battery pack structure. Background Technology

[0002] Lead-acid batteries pose a serious threat to human health because lead is extremely harmful to the human body; even trace amounts can cause severe health problems. Furthermore, improper disposal of used lead-acid batteries, often with excessive lead content, can lead to severe environmental pollution and seriously endanger public health. Therefore, for environmental reasons, the production and use of lead-acid batteries have been restricted.

[0003] Currently, for the use of lithium-ion / sodium-ion battery packs, whether they are pouch cells, cylindrical cells, or prismatic cells, lithium-ion / sodium-ion batteries are basically produced as individual units. If they are to be used in specific applications, such as electric vehicles, electric bicycles, or energy storage modules, a PACK production line needs to be established, and then PACKs are assembled and used according to demand. This requires a large investment in space, materials, and manpower. If a battery fails, highly specialized personnel are needed to repair and replace it, resulting in high usage costs and a high barrier to entry.

[0004] Typically, the vast majority of power battery casings are made of stretched aluminum alloy. To improve energy density, the aluminum casings are very thin. If the positive and negative terminals of one battery accidentally touch the casing of another battery, causing a short circuit, very quickly (usually a fraction of a second), the casing of the other battery will be burned through by the powerful current from the violent discharge of the short-circuited battery. This can easily ignite the free electrolyte inside the battery, causing a fire.

[0005] Utility Model Content

[0006] This utility model provides a multi-cavity battery pack structure, which aims to solve the problems of thin cell casing and high safety risks of traditional lithium battery cells.

[0007] To achieve the above objectives, this utility model provides a multi-cavity battery pack structure, including a housing, a cover plate, and several individual battery cells; the individual battery cells are disposed inside the housing, and the cover plate covers one end face of the housing;

[0008] The housing includes a housing body and several cavity units disposed within the housing body. Adjacent cavity units are separated by wall panels, which abut against the bottom surface and side surface of the housing body, respectively. Each cavity unit has a first protrusion at one end near the cover plate and a second protrusion at the other end. A battery cell is disposed within each cavity unit, between the first and second protrusions. Each battery cell corresponds to one cavity unit.

[0009] The second protrusions are connected in pairs; the first protrusions in the middle are connected in pairs, and the first protrusions at both ends are independently configured.

[0010] In a preferred embodiment, the first boss, the cavity unit, the second boss, and the housing body are integrally formed.

[0011] In a preferred embodiment, the housing further includes a first side cover and a second side cover, wherein the first side cover is disposed on the end face of the housing body near the end of the first boss; and the second side cover is disposed on the end face of the housing body near the end of the second boss.

[0012] In a preferred embodiment, the first side cover and the second side cover are symmetrically arranged; gaps are provided between the first side cover and the housing body, and between the second side cover and the housing body.

[0013] In a preferred embodiment, the battery cell includes a battery body, a positive electrode connector, and a negative electrode connector. The positive electrode connector is disposed at one end of the battery body, and the negative electrode connector is disposed at the other end of the battery body.

[0014] In a preferred embodiment, several of the battery cells are connected in series; two adjacent battery cells are connected in series through a terminal connector; among the battery cells connected in series, the battery cells at both ends are connected to the terminals through a positive terminal and a negative terminal, respectively.

[0015] In a preferred embodiment, the electrode connector is disposed on the first protrusion or the second protrusion that are connected in a continuous manner; the positive electrode and the negative electrode are respectively disposed on the first protrusion that are independently disposed.

[0016] In a preferred embodiment, among the two battery cells at both ends, the positive electrode connecting piece of one battery cell is connected to the positive terminal through the positive terminal post, and the negative electrode connecting piece of the other battery cell is connected to the negative terminal through the negative terminal post.

[0017] In a preferred embodiment, the positive terminal and the negative terminal are respectively sealed to the housing via radial compression sealing rings.

[0018] In a preferred embodiment, the electrode connector includes a positive electrode connector, a negative electrode connector, and a fixing member; the positive electrode connector and the negative electrode connector are integrally formed, the positive electrode connector is connected to the positive electrode connecting piece, and the negative electrode connector is connected to the negative electrode connecting piece; the positive electrode connector is provided with a fixing hole, and the fixing member fixes the electrode connector to the first boss or the second boss that are connected in communication through the fixing hole.

[0019] In a preferred embodiment, the cover plate is provided with an independent explosion-proof valve and a liquid injection hole; the explosion-proof valve is fixed to the cover plate by an explosion-proof valve anti-reverse ring, and a sealing rubber ring is provided between the explosion-proof valve and the cover plate; the liquid injection hole is sealed by a steel ball.

[0020] In a preferred embodiment, the housing is further provided with an equalization circuit board and a BMS control board, which are respectively connected to the individual battery cells.

[0021] In a preferred embodiment, the battery cell is a wound core; the housing is a plastic housing; the cover plate is a plastic cover plate; and the explosion-proof valve is an aluminum alloy explosion-proof valve. The aluminum alloy explosion-proof valve provides a stable and reliable explosion-proof pressure value; the explosion-proof valve's anti-reverse ring can be directly pressed to prevent retraction, allowing for quick and reliable fixing of the explosion-proof valve to the cover plate.

[0022] In a preferred embodiment, the core is a lithium-ion battery core or a sodium-ion battery core.

[0023] In this application's structure, multiple cavity units are set within the casing via wall panels, effectively increasing the casing's strength in the thickness direction, allowing the battery to withstand greater expansion forces without easily deforming. Furthermore, it boasts advantages such as small size, large capacity, light weight, and high energy density. Simultaneously, it functions as a lithium-ion or sodium-ion battery pack, eliminating the need for separate PACK design and assembly, saving PACK costs and time. This application's structure is simple, has low manufacturing costs, small size, good sealing, high battery energy density, and is pollution-free and environmentally friendly, suitable for large-capacity and large-size battery structures. This application's structure eliminates the need for PACK assembly, directly replacing lead-acid batteries, greatly simplifying customer installation and use, and eliminating the need for a separate PACK production line, saving space, materials, and manpower. Through this application's structure, the voltage and temperature of each cell can be accurately detected and collected, enabling timely interruption of overcharge and over-discharge currents, with performance identical to battery packs assembled using a dedicated pack. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the overall structure of a multi-cavity battery pack according to an embodiment of the present invention.

[0026] Figure 2 is an exploded structural diagram of the multi-cavity battery pack structure in Figure 1.

[0027] Figure 3 is a cross-sectional schematic diagram of the multi-cavity battery pack structure in Figure 1.

[0028] Figure 4 is a schematic diagram of the exploded structure of the shell in Figure 2;

[0029] Figure 5 is a schematic diagram of the structure of a single battery cell in Figure 2;

[0030] Figure 6 is a schematic diagram of the pole connector in Figure 2. Detailed Implementation

[0031] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, top, bottom, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] Specifically, as shown in Figures 1 to 3, this embodiment of the present invention provides a multi-cavity battery pack structure, including a housing 10, a cover plate 20, and several individual battery cells 30; the individual battery cells 30 are disposed inside the housing 10, and the cover plate 20 covers one end face of the housing 10;

[0037] The housing 10 includes a housing body 11 and several cavity units 12 disposed within the housing body 11. Adjacent cavity units 12 are separated by wall panels 13, which abut against the bottom surface and side surface of the housing body 11, respectively. Each cavity unit 12 has a first protrusion 121 at one end near the cover plate 20 and a second protrusion 122 at the other end. A battery cell 30 is disposed within each cavity unit 12, between the first protrusion 121 and the second protrusion 122. Each battery cell 30 corresponds to one cavity unit 12.

[0038] The second protrusion 122 is connected in pairs; the first protrusion 121 in the middle is connected in pairs, and the first protrusion 121 at both ends is independently set.

[0039] By setting multiple cavity units 12 inside the housing 10 through the wall panel 13, the strength of the housing 10 in the thickness direction is effectively increased, so that the battery can withstand greater expansion force and is not easily deformed, thereby increasing the safety of the battery.

[0040] In a preferred embodiment, the first boss 121, the cavity unit 12, the second boss 122, and the housing body 11 are integrally formed. By providing the first boss and the second boss, it is convenient to realize the series and parallel connection of individual cells within the cavity unit, effectively saving space and facilitating modular assembly. It can be used for assembly without the need for additional PACK design and assembly, saving PACK costs and time.

[0041] As a preferred embodiment, as shown in FIG4, the housing 10 further includes a first side cover 14 and a second side cover 15. The first side cover 14 is disposed on the end face of the housing body 11 near the first boss 121; the second side cover 15 is disposed on the end face of the housing body 11 near the second boss 122.

[0042] In a preferred embodiment, the first side cover 14 and the second side cover 15 are symmetrically arranged; gaps are provided between the first side cover 14 and the housing body 11, and between the second side cover 15 and the housing body 11. This allows the housing to be adapted to the first and second protrusions, facilitating the series and parallel connection of individual battery cells within the cavity unit, ensuring the insulation safety of the housing, and facilitating modular assembly.

[0043] As a preferred embodiment, as shown in FIG5, the battery cell 30 includes a battery cell body 31, a positive electrode connecting piece 32, and a negative electrode connecting piece 33. The positive electrode connecting piece 32 is disposed at one end of the battery cell body 31, and the negative electrode connecting piece 33 is disposed at the other end of the battery cell body 31. This allows the battery cell to be adapted to the first protrusion and the second protrusion, facilitating the series and parallel connection of battery cells within the cavity unit, effectively saving space, and enabling modular assembly.

[0044] In a preferred embodiment, several battery cells 30 are connected in series; two adjacent battery cells 30 are connected in series through a terminal connector 40; among the battery cells 30 connected in series, the battery cells 30 at both ends are connected to terminals (not shown in the figure) through a positive terminal 50 and a negative terminal 60, respectively.

[0045] In a preferred embodiment, the electrode connector 40 is disposed on the first boss 121 or the second boss 122 that are connected in communication; the positive electrode 50 and the negative electrode 60 are respectively disposed on the first boss 121 that are independently disposed.

[0046] In a preferred embodiment, among the two battery cells 30 located at both ends, the positive electrode connecting piece 32 of one battery cell 30 is connected to the positive terminal through the positive electrode post 50, and the negative electrode connecting piece 33 of the other battery cell 30 is connected to the negative terminal through the negative electrode post 60.

[0047] In a preferred embodiment, the positive terminal 50 and the negative terminal 60 are respectively sealed to the housing 10 by radial compression sealing rings 70. This ensures a good seal between the connections.

[0048] As a preferred embodiment, as shown in Figure 6, the electrode connector 40 includes a positive electrode connector 41, a negative electrode connector 42, and a fixing member 43. The positive electrode connector 41 and the negative electrode connector 42 are integrally formed. The positive electrode connector 41 is connected to the positive electrode connecting piece 32, and the negative electrode connector 42 is connected to the negative electrode connecting piece 33. The positive electrode connector 41 is provided with a fixing hole (not shown in the figure), and the fixing member 43 fixes the electrode connector 40 to the first protrusion 121 or the second protrusion 122 through the fixing hole. In this way, the electrode connector can be adapted to the first protrusion and the second protrusion, which facilitates the series and parallel connection of individual cells in the cavity unit, effectively saves space, and is easy to assemble in a modular manner.

[0049] As a preferred embodiment, as shown in Figure 2, the cover plate 20 is provided with an independent explosion-proof valve 21 and an injection hole 22; the explosion-proof valve 21 is fixed to the cover plate 20 by an explosion-proof valve anti-reverse ring 211, and a sealing ring 212 is provided between the explosion-proof valve 21 and the cover plate 20; the injection hole 22 is sealed by a steel ball (not shown in the figure). By directly pressing the explosion-proof valve anti-reverse ring to prevent it from retracting, the explosion-proof valve can be quickly and reliably fixed to the cover plate.

[0050] In a preferred embodiment, the housing 10 also includes an equalization circuit board (not shown in the figure) and a BMS control board (not shown in the figure), which are respectively connected to the individual battery cells 30. This allows for the direct use of a single battery cell or the series-parallel connection of multiple battery cells. Furthermore, the voltage and temperature of each cell can be accurately detected and collected, enabling timely interruption of overcharge and over-discharge currents, achieving performance identical to that of a battery pack assembled from multiple battery cells.

[0051] In a preferred embodiment, the battery cell 30 is a wound core; the housing 10 is a plastic housing; the cover plate 20 is a plastic cover plate; and the explosion-proof valve 21 is an aluminum alloy explosion-proof valve. The aluminum alloy explosion-proof valve provides a stable and reliable explosion-proof pressure value; the explosion-proof valve's anti-reverse ring can be directly pressed to prevent retraction, allowing for quick and reliable fixing of the explosion-proof valve to the cover plate.

[0052] In a preferred embodiment, the core is a lithium-ion battery core or a sodium-ion battery core.

[0053] In this application's structure, multiple cavity units are set within the casing via wall panels, effectively increasing the casing's strength in the thickness direction, allowing the battery to withstand greater expansion forces without easily deforming. Furthermore, it boasts advantages such as small size, large capacity, light weight, and high energy density. Simultaneously, it functions as a lithium-ion or sodium-ion battery pack, eliminating the need for separate PACK design and assembly, saving PACK costs and time. This application's structure is simple, has low manufacturing costs, small size, good sealing, high battery energy density, and is pollution-free and environmentally friendly, suitable for large-capacity and large-size battery structures. This application's structure eliminates the need for PACK assembly, directly replacing lead-acid batteries, greatly simplifying customer installation and use, and eliminating the need for a separate PACK production line, saving space, materials, and manpower. Through this application's structure, the voltage and temperature of each cell can be accurately detected and collected, enabling timely interruption of overcharge and over-discharge currents, with performance identical to battery packs assembled using a dedicated pack.

[0054] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-cavity battery pack structure, characterized in that, It includes a housing, a cover plate, and several individual battery cells; the individual battery cells are disposed inside the housing, and the cover plate covers one end face of the housing; The housing includes a housing body and several cavity units disposed within the housing body. Adjacent cavity units are separated by wall panels, which abut against the bottom surface and side surface of the housing body, respectively. Each cavity unit has a first protrusion at one end near the cover plate and a second protrusion at the other end. A battery cell is disposed within each cavity unit, between the first and second protrusions. Each battery cell corresponds to one cavity unit. The second protrusions are connected in pairs; the first protrusions in the middle are connected in pairs, and the first protrusions at both ends are independently configured.

2. The multi-cavity battery pack structure according to claim 1, characterized in that, The first boss, the cavity unit, the second boss, and the housing body are integrally formed.

3. The multi-cavity battery pack structure according to claim 1, characterized in that, The housing also includes a first side cover and a second side cover. The first side cover is disposed on the end face of the housing body near the end of the first boss. The second side cover is disposed on the end face of the housing body near the end of the second boss.

4. The multi-cavity battery pack structure according to claim 3, characterized in that, The first side cover and the second side cover are symmetrically arranged; gaps are provided between the first side cover and the housing body, and between the second side cover and the housing body.

5. The multi-cavity battery pack structure according to claim 1, characterized in that, The battery cell includes a battery body, a positive electrode connector, and a negative electrode connector. The positive electrode connector is disposed at one end of the battery body, and the negative electrode connector is disposed at the other end of the battery body.

6. The multi-cavity battery pack structure according to claim 5, characterized in that, Several of the aforementioned battery cells are connected in series; two adjacent battery cells are connected in series via terminal connectors; among the battery cells connected in series, the battery cells at both ends are connected to terminals via positive and negative terminals, respectively.

7. The multi-cavity battery pack structure according to claim 6, characterized in that, The electrode connector is disposed on the first protrusion or the second protrusion that are connected in a continuous manner; the positive electrode and the negative electrode are respectively disposed on the first protrusion that are independently disposed.

8. The multi-cavity battery pack structure according to claim 7, characterized in that, In the two battery cells at both ends, the positive terminal of one battery cell is connected to the positive terminal through the positive terminal post, and the negative terminal of the other battery cell is connected to the negative terminal through the negative terminal post. The positive terminal and the negative terminal are respectively sealed to the housing by radial compression sealing rings.

9. The multi-cavity battery pack structure according to claim 8, characterized in that, The electrode connector includes a positive electrode connector, a negative electrode connector, and a fixing member; the positive electrode connector and the negative electrode connector are integrally formed, the positive electrode connector is connected to the positive electrode connecting piece, and the negative electrode connector is connected to the negative electrode connecting piece; the positive electrode connector is provided with a fixing hole, and the fixing member fixes the electrode connector to the first boss or the second boss that are connected in communication through the fixing hole.

10. The multi-cavity battery pack structure according to claim 9, characterized in that, The cover plate is provided with independent explosion-proof valves and injection holes; the explosion-proof valves are fixed to the cover plate by explosion-proof valve anti-reverse rings, and a sealing ring is provided between the explosion-proof valves and the cover plate; the injection holes are sealed by steel balls. The housing also contains an equalization circuit board and a BMS control board, which are respectively connected to the individual battery cells. The battery cell is a wound core; the housing is a plastic housing; the cover plate is a plastic cover plate; the explosion-proof valve is an aluminum alloy explosion-proof valve; The core is a lithium-ion battery core or a sodium-ion battery core.

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