Square battery convenient to integrate and battery module

Abstract

The invention relates to the technical field of lithium battery assembly, and particularly discloses a square battery convenient to integrate and a battery module.The square battery comprises a roll core, a core rod, a square shell, a positive electrode cover plate and a negative electrode cover plate, and a plurality of liquid passing channels are distributed in the core rod in the length direction of the core rod; one of the positive electrode cover plate and the negative electrode cover plate is provided with a bayonet socket and a mounting seat, and the other one is provided with a connecting plug and a liquid passing structure body; the battery module comprises a plurality of square batteries convenient to integrate, and the adjacent square batteries are connected in an inserted mode through a positive electrode cover plate and a negative electrode cover plate. The square battery provided by the invention is simple in integration operation, low in integration cost and high in integration efficiency; the obtained battery module is compact in structure, high in space utilization rate, favorable for obtaining relatively high battery energy density and simple to disassemble, and is convenient to disassemble and reassemble when one or some single batteries have problems, so that the maintenance operation is simplified, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery assembly, and in particular to a square battery and a battery module that are convenient for integration. Background Art

[0002] Square batteries are relatively mainstream batteries among currently commercial batteries. The applicant has previously proposed a fast temperature-controlled lithium-ion battery (Chinese Patent Application No. 202411188433.4), the battery core of which includes a runway-shaped wound core and a core rod with a liquid passing channel arranged inside. Since the coolant flowing through the liquid passing channel located on the core rod can directly cool the inside of the battery core, the heat dissipation capacity of the battery core is greatly improved. When this battery core is assembled into a square battery, even if a coolant accommodation cavity is not provided at the positions corresponding to the four sides of the battery core on the housing, the resulting square battery still has good heat dissipation capacity. However, when multiple square battery cores are integrated, in terms of the current structure, the integration operation not only involves electrical connection achieved through welding, but also involves separately arranging pipes to achieve coolant conduction. As is well known, electrical connection by welding not only has the problems that the consistency is not easy to control, it is not easy to detect, and there is a risk of false soldering, but also the assembled battery pack is not convenient to disassemble and assemble and difficult to repair; in addition, there are also problems such as a long integration process, low integration efficiency, complex process, and high cost. Separately arranging pipes to achieve coolant conduction will not only have an adverse impact on the cooling efficiency and effect of the coolant, but also occupy limited battery space, which is not conducive to improving the energy density of the battery system; moreover, such a design structure also has problems such as complex integration process, low integration efficiency, and high integration cost when performing battery core integration subsequently.

[0003] How to improve the above square battery to facilitate electrical connection and coolant conduction during single battery integration will help to solve the above problems. For this reason, this application is proposed. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides a square battery and a battery module that are convenient for integration.

[0005] To achieve the above object, the main technical solutions adopted by the present invention include:

[0006] On the one hand, the present invention proposes a square battery that is convenient for integration, including a wound core, a core rod, a square housing, a positive electrode cover plate, and a negative electrode cover plate. A plurality of liquid passing channels are distributed along the length direction of the core rod. One of the positive electrode cover plate and the negative electrode cover plate is provided with a plug socket and a mounting seat, and the other is provided with a plug joint and a liquid passing structure body;

[0007] The socket includes a bottom plate and a fence. The fence is arranged on the outer periphery of the bottom plate and forms a plugging cavity that is closed at one end and open at the opposite end with the bottom plate. A plurality of limiting grooves are formed on the fence, and a plurality of elastic connectors are vertically fixed on the bottom plate; the plug connector includes a plug connector body. A plurality of jacks are vertically formed in the plug connector body along its height direction. A plurality of pressing members elastically telescopically connected to the outer periphery are further arranged on the outer periphery of the plug connector body; the structure of the plug connector body matches the structure of the plugging cavity, the number and structure of the elastic connectors match the number and structure of the jacks, and the number and structure of the pressing members match the number and structure of the limiting grooves. After the plug connector body is inserted into the plugging cavity, the elastic connectors are located in the jacks and the pressing members are snapped into the limiting grooves;

[0008] The mounting seat includes an annular fence and slots are formed on the side wall of the fence; a through liquid flow channel is arranged inside the liquid passing structure body. A plurality of liquid flow channels are distributed along the height direction of the liquid passing structure body and limiting clamping strips elastically telescopic with it are arranged on the side wall of the liquid passing structure body; the outer periphery of the liquid passing structure body matches the inner periphery structure of the fence, the position and structure of the limiting clamping strips match the position and structure of the slots. After the liquid passing structure body is inserted into the fence, the limiting clamping strips are snapped into the slots;

[0009] The socket and the plug connector are both electrically connected to the core, and the mounting seat and the liquid passing structure body are both communicated with the liquid passing channel.

[0010] Preferably, the cross section of the fence is in a racetrack-shaped structure. There are a plurality of liquid flow channels, and the plurality of liquid flow channels are arranged in a "one" shape in the length direction of the liquid passing structure body.

[0011] Preferably, the racetrack-shaped structure includes two opposite straight line segments and two opposite arc segments. The slots are strip-shaped and the number is 2. The two slots are arranged oppositely and are formed on the side walls of the straight line segments. The upper surface of the limiting clamping strip is a smooth arc surface or an inclined surface.

[0012] Preferably, a step Ⅰ is arranged around the lower part of the inner wall of the fence in a circle, and a sealing ring is arranged on the step Ⅰ. The liquid passing structure body includes a plug block Ⅰ and a plug block Ⅱ. The plug block Ⅱ is fixed on the upper surface of the plug block Ⅰ and a clamping step is formed at the connection between the plug block Ⅱ and the plug block Ⅰ. The clamping step matches the structure of the step Ⅰ, and the limiting clamping strip is arranged on the side wall of the plug block Ⅰ.

[0013] Preferably, the plug connector body includes a first plugging section and a second plugging section. The jacks are through holes vertically formed along the height direction of the first plugging section and the second plugging section. A step structure is formed at the connection between the first plugging section and the second plugging section. A first clamping step is arranged at the bottom of the plugging cavity, and the step structure matches the structure of the first clamping step.

[0014] Preferably, the elastic connecting member includes a large insertion post, a small insertion post, and a coil spring. The small insertion post is fixedly connected to the upper end surface of the large insertion post. The coil spring is sleeved on the small insertion post and one end thereof is fixedly connected to the upper end surface. The lower end surface of the large insertion post is fixedly connected to the bottom plate. A step structure is formed at the connection between the large insertion post and the small insertion post. A second engaging step is provided in the insertion hole, and the step structure matches the second engaging step structure.

[0015] Preferably, four strip-shaped limiting grooves are evenly formed on the enclosure, and four pressing members are provided corresponding to the four limiting grooves.

[0016] Preferably, the bottom plate is of a circular structure, the first engaging step is of an annular structure, and the plug connector body is of a cylindrical structure.

[0017] Compared with the prior art, by providing the mounting seat and the liquid passing structure body, the present invention enables the conduction of the coolant between single cells through quick insertion of the head and tail, which not only reduces the liquid cooling transmission path, improves the cooling efficiency of the coolant, but also saves the integration space and helps to increase the energy density of the system; by providing the socket and the plug connector, the present invention enables the electrical connection between single cells through quick insertion of the head and tail, which not only improves the stability of the connection between the positive and negative electrode posts, but also reduces the process difficulty and process cost of single cell integration; the obtained square battery makes the integration operation simple and the integration cost low, especially helps to improve the efficiency of single cell grouping, and also facilitates the disassembly and maintenance of single cells, which helps to reduce the maintenance cost.

[0018] On the other hand, the present invention provides a battery module, which includes a plurality of square batteries that are convenient for integration. Adjacent square batteries are plugged together through the positive electrode cover plate and the negative electrode cover plate.

[0019] Preferably, adjacent square batteries are electrically connected through a conductive connecting member and liquid is guided through a liquid guiding connecting member.

[0020] The conductive connecting member includes a socket, a plug connector, and a conductive connecting plate. The socket and the plug connector are respectively arranged at both ends of the conductive connecting plate.

[0021] The liquid guiding connecting member includes a mounting seat, a liquid passing structure body, and a liquid guiding connecting seat. The liquid guiding connecting seat includes a liquid guiding pipe and a first liquid collecting member and a second liquid collecting member arranged at both ends of the liquid guiding pipe. The first liquid collecting member is communicated with the mounting seat, and the second liquid collecting member is communicated with the liquid passing structure body.

[0022] Compared with the prior art, the battery module obtained by integrating the above square batteries according to the present invention has a compact structure and high space utilization rate, which helps to obtain a high battery energy density, and is easy to disassemble. When a certain or some single cells have problems, it is convenient for disassembly and reassembly, which simplifies the maintenance operation and reduces the maintenance cost. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 This is an embodiment of a square lithium battery that is convenient for integration proposed by the present invention.

[0025] Figure 2 For Figure 1 The three-dimensional structure diagram of the socket in

[0026] Figure 3 For Figure 2 The three-dimensional structure diagram of the elastic connecting piece in

[0027] Figure 4 For Figure 2 The top view of

[0028] Figure 5 For Figure 2 The front view of

[0029] Figure 6 For Figure 1 The three-dimensional structure diagram of the plug-in joint in

[0030] Figure 7 For Figure 6 The enlarged structure diagram at M in

[0031] Figure 8 For Figure 6 The top view of

[0032] Figure 9 For Figure 8 The enlarged structure diagram at N in

[0033] Figure 10 For Figure 6 The front view of

[0034] Figure 11 For Figure 6 The bottom view of

[0035] Figure 12 For Figure 1 The three-dimensional structure diagram of the mounting base in

[0036] Figure 13 For Figure 12 The front view of

[0037] Figure 14 For Figure 12Top view;

[0038] Figure 15 is Figure 1 Schematic diagram of the three-dimensional structure of the liquid-passing structure body in

[0039] Figure 16 is Figure 15 Top view;

[0040] Figure 17 is Figure 15 Bottom view;

[0041] Figure 18 is Figure 15 Front view;

[0042] Figure 19 is Figure 15 Left view;

[0043] Figure 20 Schematic diagram of the structure of the conductive connection member in the present invention;

[0044] Figure 21 Schematic diagram of the structure of the liquid-conducting connection member in the present invention;

[0045] Figure 22 An embodiment of the battery module proposed by the present invention;

[0046] Figure 23 is Figure 22 Enlarged schematic diagram of the structure at P in

[0047] Figure 24 is Figure 22 Top view;

[0048] Figure 25 is Figure 24 Enlarged schematic diagram of the structure at Q in

[0049] Figure 26 is Figure 22 Left view;

[0050] Figure 27 is Figure 22 Front view;

[0051] Figure 28 A conduction method of the coolant in the battery module proposed by the present invention;

[0052] Figure 29 Another conduction method of the coolant in the battery module proposed by the present invention.

[0053] In the figure: A, socket; A1, enclosure; A11, limit groove; A2, first engaging step; A3, bottom plate; A4, elastic connecting member; A41, large plug post; A42, small plug post; A43, coil spring; B, plug; B1, first plugging section; B2, second plugging section; B21, jack; B22, second engaging step; B3, pressing member; C, mounting seat; C1, enclosure; C2, step I; C3, sealing ring; C4, slot; D, liquid passing structure body; D1, plug block I; D2, plug block II; D21, liquid flow channel; D3, limit clamping strip; E, liquid guiding connection seat; E1, first liquid collecting member; E2, second liquid collecting member; E3, liquid guiding pipe; F, conductive connecting plate. Detailed implementation manner

[0054] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0055] It should be noted that: the components or structures not described in detail below all adopt the conventional technical means in the art. Those skilled in the art can combine and use them without creative efforts.

[0056] As Figures 1 - 19 As commonly shown: The present invention provides a square battery convenient for integration, including a winding core, a core rod, a square housing, a positive electrode cover plate and a negative electrode cover plate. A plurality of liquid passing channels are distributed along the length direction of the core rod. One of the positive electrode cover plate and the negative electrode cover plate is provided with a socket A and a mounting seat C, and the other is provided with a plug B and a liquid passing structure body D;

[0057] The socket A includes a bottom plate A3 and an enclosure A1. The bottom plate A3 is a circular structure. The enclosure A1 is arranged on the outer periphery of the bottom plate A3 and forms a plugging cavity with one end closed and the opposite end open with the bottom plate A3. A plurality of limit grooves A11 are formed on the enclosure A1. A plurality of elastic connecting members A4 are vertically fixed on the bottom plate A3. The plug B includes a plug body. A plurality of jacks B21 are vertically formed along the height direction of the plug body. A plurality of pressing members B3 elastically telescopically connected to the outer periphery are further arranged on the outer periphery of the plug body. The structure of the plug body matches the structure of the plugging cavity. The number and structure of the elastic connecting members A4 match the number and structure of the jacks B21. The number and structure of the pressing members B3 match the number and structure of the limit grooves A11. After the plug body is inserted into the plugging cavity, the elastic connecting members A4 are located in the jacks B21 and the pressing members B3 are clamped into the limit grooves A11;

[0058] The mounting base C includes an annular retaining wall C1, and a slot C4 is formed on the side wall of the retaining wall C1; a through liquid flow channel D21 is arranged in the through liquid structure body D, and a plurality of liquid flow channels D21 are distributed along the height direction of the through liquid structure body D, and a limiting clamping strip D3 that elastically expands and contracts with it is arranged on the side wall of the through liquid structure body D; the outer periphery of the through liquid structure body D matches the inner peripheral structure of the retaining wall C1, the positions and structures of the limiting clamping strip D3 and the slot C4 match, and after the through liquid structure body D is inserted into the retaining wall C1, the limiting clamping strip D3 is clamped into the slot C4;

[0059] The plug socket A and the plug B are both electrically connected to the core, and the mounting base C and the through liquid structure body D are both communicated with the through liquid channel.

[0060] It should be noted that:

[0061] In specific practice, the bottom plate A3 can also be rectangular, square or other structures, and the shape of the plug body corresponds to the shape of the bottom plate A3; a plurality of elastic connectors A4 are evenly and symmetrically distributed on the bottom plate A3, and the number of elastic connectors A4 can be flexibly determined according to actual needs in specific practice to balance cost, performance and connection operability; a plurality of jacks B21 are evenly and symmetrically distributed on the plug body.

[0062] The connection relationship between the pressing member B3 and the outer periphery of the plug body is prior art. For example, an installation groove can be formed on the outer periphery of the plug body, a spring structure is arranged in the installation groove, and the pressing member B3 is elastically connected with the installation groove through the spring structure. When the pressing member B3 is externally pressed, it will automatically contract into the installation groove, and when the external force disappears, the pressing member B3 automatically pops out and enters the limiting groove A11, similar to an existing door lock.

[0063] The connection relationship between the limiting clamping strip D3 and the side wall of the through liquid structure body D is prior art. For example, an installation groove can be formed on the outer surface of the side wall of the through liquid structure body D, a spring structure is arranged in the installation groove, and the limiting clamping strip D3 is elastically connected with the installation groove through the spring structure. When the limiting clamping strip D3 is externally pressed, it will automatically contract into the installation groove, and when the external force disappears, the limiting clamping strip D3 automatically pops out again, similar to an existing door lock.

[0064] Take Figure 1 as an example: The negative electrode cover plate is located at one end of the square battery, and the positive electrode cover plate is arranged at the opposite end of the square battery. When two square batteries are grouped, the negative electrode cover plate of one square battery is arranged opposite to the positive electrode cover plate of the other square battery, and electrical connection and conduction of the coolant are realized by inserting the plug B into the plug socket A and inserting the through liquid structure body D into the mounting base C.

[0065] The way of inserting the plug connector B into the socket A to achieve electrical connection has the following beneficial effects compared with the prior art: (1) The quick-insert connection method not only reduces the cost of pole connection but also reduces the possibility of poor pole connection, improving the yield rate; (2) It is convenient to operate, reducing the process difficulty of single-cell integration and improving the efficiency of single-cell grouping; (3) It facilitates the disassembly and maintenance of single cells, helping to reduce the maintenance cost.

[0066] The way of inserting the liquid-passing structure body D into the mounting seat C to achieve coolant conduction has the following beneficial effects compared with the prior art: (1) The quick-insert connection method is simple, convenient and fast to operate, making the integration operation simple, with high integration efficiency and low integration cost; (2) There is no need to additionally set up connection pipes, which not only reduces the liquid-cooling transmission path, improves the cooling efficiency of the coolant, but also saves the integration space, helping to improve the energy density of the system; (3) It facilitates the disassembly and maintenance of single cells, helping to reduce the maintenance cost.

[0067] Compared with the prior art, the square battery obtained by the present invention makes the integration operation simple and the integration cost low, especially helps to improve the efficiency of single-cell grouping, and also facilitates the disassembly and maintenance of single cells, helping to reduce the maintenance cost.

[0068] As a preferred technical solution, in another embodiment of the present invention, the cross-section of the enclosure C1 is in a racetrack shape, and there are several liquid flow channels D21. The several liquid flow channels D21 are arranged in a "one" shape in the length direction of the liquid-passing structure body D.

[0069] In order to collect and distribute the coolant in a timely and effective manner, the position and structure of the liquid flow channels D21 are designed according to specific circumstances in practice. When the present invention is used for the square battery described in the background art, the structure, position and number of the liquid flow channels D21 are preferably matched with the structure, position and number of the liquid-cooling channels on the mandrel. That is, the cross-section of the liquid flow channels D21 is preferably in a long strip shape, and the length of the long strip shape is in the same direction as the length of the liquid-passing structure body D. The corners of the long strip shape are in arc transition, which helps to ensure that the coolant is timely collected and redistributed to flow into the next square battery evenly, quickly and efficiently.

[0070] As a preferred technical solution, in another embodiment of the present invention, the racetrack shape includes two opposite straight segments and two opposite arc segments. The slot C4 is in a long strip shape and the number is 2. The two slots C4 are arranged oppositely and are opened on the side walls of the straight segments. The upper surface of the limit card strip D3 is a smooth arc surface or an inclined surface.

[0071] To correspond to the structure and number of the slots C4, the limit card strips D3 are also strip-shaped and there are two of them. To improve the smoothness and silkiness when the limit card strips D3 enter the slots C4, the upper surface of the limit card strips D3 is a smooth arc surface or inclined surface. When the liquid-passing structure body D is inserted into the mounting seat C, the extrusion force acts indirectly on the arc surface or inclined surface, causing the limit card strips D3 to gradually expand and contract until the liquid-passing structure body D is completely inserted into the mounting seat C. After that, the limit card strips D3 return to their original state and expand in the slots C4, so that the liquid-passing structure body D is firmly installed in the mounting seat C without loosening or falling off.

[0072] As a preferred technical solution, in another embodiment of the present invention, a step Ⅰ C2 is provided around the lower part of the inner wall of the enclosure C1. A sealing ring C3 is provided on the step Ⅰ C2. The liquid-passing structure body D includes a plug Ⅰ D1 and a plug Ⅱ D2. The plug Ⅱ D2 is fixed on the upper surface of the plug Ⅰ D1, and a clamping step is formed at the connection between the plug Ⅱ D2 and the plug Ⅰ D1. The clamping step matches the structure of the step Ⅰ C2, and the limit card strips D3 are arranged on the side wall of the plug Ⅰ D1.

[0073] After the liquid-passing structure body D is inserted into the mounting seat C, the clamping step cooperates with the step Ⅰ C2, which not only provides a clear assembly direction and positioning point, making the assembly and disassembly processes simpler and faster, but also can reduce the gap after insertion and limit the relative displacement between the two, reducing the risk of loosening and falling off and improving the reliability of the connection.

[0074] As a preferred technical solution, in another embodiment of the present invention, the plug connector body includes a first plugging section B1 and a second plugging section B2. The jack B21 is a through hole vertically opened along the height direction of the first plugging section B1 and the second plugging section B2. A step structure is formed at the connection between the first plugging section B1 and the second plugging section B2. A first clamping step A2 is provided at the bottom of the plugging cavity. The step structure matches the structure of the first clamping step A2.

[0075] When the plug connector B is inserted into the socket A, the step structure is clamped with the first clamping step A2, and under the limiting action of the pressing member B3, the plug connector B is stably connected and in close contact with the socket A, thereby improving the stability after the connection of adjacent single-cell electrode columns and enhancing the safety of the battery. The structure in which the step structure cooperates with the first clamping step A2 not only provides a clear assembly direction and positioning point, making the assembly and disassembly processes simpler and faster, but also can reduce the gap after insertion and limit the relative displacement between the two, reducing the risk of loosening and falling off and improving the reliability of the connection.

[0076] In this embodiment, the jack B21 is designed as a through hole structure that is easy to process, and the upper and lower ends of the through hole structure penetrate through both ends of the plug connector body.

[0077] As a preferred technical solution, in another embodiment of the present invention, the elastic connecting member A4 includes a large plug post A41, a small plug post A42, and a coil spring A43. The small plug post A42 is fixedly connected to the upper end surface of the large plug post A41. The coil spring A43 is sleeved on the small plug post A42 and one end thereof is fixedly connected to the upper end surface. The lower end surface of the large plug post A41 is fixedly connected to the bottom plate A3. In specific practice, the free end of the coil spring A43 is slightly higher than the top end of the small plug post A42 to ensure that after the elastic connecting member A4 is inserted into the jack B21, the coil spring A43 can provide a compressive force to ensure good contact between the positive and negative electrode posts. A stepped structure is formed at the connection between the large plug post A41 and the small plug post A42, and a second engaging step B22 is provided in the jack B21. The stepped structure matches the structure of the second engaging step B22. After the elastic connecting member A4 is inserted into the jack B21, the stepped structure engages with the second engaging step B22, which facilitates assembly and is more conducive to achieving stable contact and limiting of the elastic connecting member A4 and the jack B21, ensuring the conductive effect after the electrode post is inserted.

[0078] As a preferred technical solution, in another embodiment of the present invention, four strip-shaped limiting grooves A11 are evenly formed on the enclosure A1, and four pressing members B3 are provided corresponding to the four limiting grooves A11. Considering the comprehensive factors of setting cost and limiting effect, the limiting groove A11 is designed as a strip-shaped structure and its length direction is distributed along the circumferential surface of the enclosure A1. The number of the limiting grooves A11 is four. After the four pressing members B3 enter the limiting grooves A11 respectively, they jointly play a limiting role, which is more conducive to the long-term and stable connection between the plug head B and the socket A.

[0079] As shown in Figures 20 - 29 collectively: The present invention also provides a battery module, including a plurality of square batteries as shown in Figure 1 shown, which are convenient for integration. Adjacent square batteries are inserted and connected through the positive electrode cover plate and the negative electrode cover plate. When a plurality of square batteries are connected in series end to end, the head and tail of each square battery are electrically connected and the coolant is conducted through the insertion connection method. At this time, no other accessories are required to assist in the electrical connection and the coolant conduction.

[0080] Furthermore, adjacent square batteries can also be electrically connected through a conductive connection member and liquid conduction can be achieved through a liquid conduction connection member; the conductive connection member includes a socket A, a plug B, and a conductive connection plate F, and the socket A and the plug B are respectively arranged at both ends of the conductive connection plate F; the liquid conduction connection member includes a mounting seat C, a liquid passing structure body D, and a liquid conduction connection seat E, and the liquid conduction connection seat E includes a liquid conduction pipe E3 and a first liquid collecting member E1 and a second liquid collecting member E2 arranged at both ends of the liquid conduction pipe E3, the first liquid collecting member E1 communicates with the mounting seat C, and the second liquid collecting member E2 communicates with the liquid passing structure body D. This embodiment mainly aims at the connection between square batteries with positive and negative cover plates arranged in a through manner, such as Figure 22 shown: several square batteries are first inserted into each other end to end to form a column of battery units, and then several columns of battery units are stacked to form a battery module. The square batteries at both ends of the battery module involve the electrical connection and coolant conduction of the upper and lower two square batteries. At this time, it cannot be achieved by a quick connection method and it is necessary to use a conductive connection member for electrical connection and a liquid conduction connection member for coolant conduction.

[0081] It should be noted that: for the battery module as shown in Figure 22 shown, there are specifically two ways of coolant conduction: the first is as shown in Figure 29 shown: the entire battery module shares a liquid cooling channel, with only one liquid inlet and one liquid outlet provided. The coolant enters from the first square battery at the bottom layer, flows through all the square batteries in a snake-like sequence, and then flows out of the battery module; the positive and negative electrodes between every two layers are opposite for electrical connection, and the square batteries between adjacent layers achieve coolant conduction through a liquid conduction connection member. The second is as shown in Figure 28 shown, with a relatively independent liquid cooling channel provided for each layer, that is, an independent liquid inlet and an independent liquid outlet are provided for each layer. The coolant first enters the first square battery of each layer, flows through the other square batteries of this layer in sequence, and then flows out from the last square battery of this layer; in this conduction method, there is no need to use a liquid conduction connection member.

[0082] For the first method, the flow path of the coolant is too long, and the cooling effect of the coolant becomes worse and worse towards the back; for the second method, the flow path of the coolant is shorter, and the cooling effect is more excellent than the first method. However, the first method saves some unnecessary structural parts compared to the second method. The square batteries in the same layer are inserted into each other end to end, and the square batteries in the upper and lower layers involved in series achieve electrical connection and coolant conduction through a conductive connection member and a liquid conduction connection member. In the case where all square batteries are connected in series, the current flow direction is consistent with the coolant flow direction, which helps to reduce costs and save space. For the second method, the square batteries in the same layer are inserted into each other end to end, and the positive and negative electrode directions of the square batteries in the upper and lower layers are the same. Since the conductive connection member and the liquid conduction connection member are independent of each other, the upper and lower layers can be connected in series or in parallel.

[0083] In addition, since the square battery expands during its entire life cycle, resulting in dimensional changes, it is difficult to maintain a constant size throughout the life cycle without external force to restrain it after stacking, and thus it cannot be installed in the battery pack. Therefore, before forming the battery module, the battery pack can be restrained by adding end plates or using steel belts to tie it. Generally, the external force applied by adding end plates is about 0.05 MPa, and the force for steel belt tying is generally between 150 - 500 kgf. To facilitate real-time observation of the battery module, monitoring points for temperature and voltage need to be added to the battery module. Moreover, to ensure that the location of the problem can be quickly detected when there is a problem with the battery module, the best solution is to add voltage detection points and temperature monitoring points at each square battery.

[0084] In summary, the square battery proposed by the present invention enables quick realization of electrical connection and coolant conduction through end-to-end plugging during integration, significantly simplifies the operation process during single battery grouping, reduces the assembly process difficulty of the battery module, and ultimately greatly improves the integration efficiency and significantly reduces the integration cost. Moreover, this grouping method helps with the disassembly of the battery module. When a single battery or some single batteries have problems, it is convenient for disassembly and reassembly, simplifies the maintenance operation, and reduces the maintenance cost.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and deformations to the above embodiments within the scope of the present invention. In addition, without contradiction, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A square battery that is easy to integrate, characterized in that: It comprises a winding core, a core rod, a square shell, a positive electrode cover plate and a negative electrode cover plate, wherein a plurality of liquid passage channels are distributed in the core rod along its length direction, one of the positive electrode cover plate and the negative electrode cover plate is equipped with a plug seat (A) and a mounting seat (C), and the other is equipped with a plug connector (B) and a liquid passage structure body (D); The plug socket (A) comprises a bottom plate (A3) and a baffle (A1), wherein the baffle (A1) is arranged on the outer periphery of the bottom plate (A3) and forms a plug cavity with the bottom plate (A3) with one end closed and the other end open, the baffle (A1) is provided with a plurality of limit grooves (A11), and a plurality of elastic connectors (A4) are vertically fixed on the bottom plate (A3); the plug connector (B) comprises a plug connector body, wherein the plug connector body is vertically provided with a plurality of plug holes (B21) along its height direction, The outer periphery of the plug connector body is also provided with a plurality of extrusion pieces (B3) elastically and telescopically connected to the outer periphery; the structure of the plug connector body matches that of the plug-in cavity, the number and structure of the elastic connection piece (A4) matches that of the plug hole (B21), and the number and structure of the extrusion piece (B3) matches that of the limit groove (A11); after the plug connector body is inserted into the plug-in cavity, the elastic connection piece (A4) is located in the plug hole (B21) and the extrusion piece (B3) is inserted into the limit groove (A11); The mounting seat (C) comprises an annular enclosure (C1) and a slot (C4) is provided on the side wall of the enclosure (C1); a transparent liquid flow channel (D21) is provided in the liquid flow structure body (D), a plurality of liquid flow channels (D21) are distributed along the height direction of the liquid flow structure body (D), and a limit clamping strip (D3) elastically retractable therefrom is provided on the side wall of the liquid flow structure body (D); the outer periphery of the liquid flow structure body (D) matches the inner periphery structure of the enclosure (C1), the position and structure of the limit clamping strip (D3) match the slot (C4), and after the liquid flow structure body (D) is inserted into the enclosure (C1), the limit clamping strip (D3) is clamped into the slot (C4); The plug socket (A) and the plug connector (B) are both electrically connected to the winding core, and the mounting seat (C) and the liquid-passing structure body (D) are both connected to the liquid-passing channel.

2. The square battery that is easy to integrate according to claim 1, characterized in that: The cross section of the enclosure (C1) is in a runway-shaped structure, and there are a plurality of liquid flow channels (D21), which are arranged in a straight line in the length direction of the liquid flow structure body (D).

3. The square battery that is easy to integrate according to claim 2, characterized in that: The runway-shaped structure comprises two opposite straight segments and two opposite arc segments, the slots (C4) are in the shape of long strips and are two in number, the two slots (C4) are arranged opposite to each other and are opened on the side walls of the straight segments, and the upper surface of the limit card strip (D3) is a smooth arc surface or a sloped surface.

4. The square battery for easy integration according to claim 3, characterized in that: A step I (C2) is arranged around the lower ring of the inner wall of the enclosure (C1), and a sealing ring (C3) is arranged on the step I (C2). The liquid-passing structure body (D) includes an insert block I (D1) and an insert block II (D2). The insert block II (D2) is fixed to the upper surface of the insert block I (D1) and forms a locking step at the connection with the insert block I (D1). The locking step matches the structure of the step I (C2), and a limiting clip strip (D3) is arranged on the side wall of the insert block I (D1).

5. The square battery for easy integration according to claim 1, characterized in that: The plug connector body comprises a first plug section (B1) and a second plug section (B2); the plug hole (B21) is a through hole vertically opened along the height direction of the first plug section (B1) and the second plug section (B2); a step structure is formed at the connection between the first plug section (B1) and the second plug section (B2); a first engaging step (A2) is provided at the bottom of the plug cavity, and the step structure matches the first engaging step (A2) structure.

6. The square battery for easy integration according to claim 1, characterized in that: The elastic connecting member (A4) comprises a large plug-in column (A41), a small plug-in column (A42) and a coil spring (A43); the small plug-in column (A42) is fixedly connected to the upper end surface of the large plug-in column (A41); the coil spring (A43) is sleeved on the small plug-in column (A42) and one end of the coil spring is fixedly connected to the upper end surface; the lower end surface of the large plug-in column (A41) is fixedly connected to the bottom plate (A3); a step structure is formed at the connection between the large plug-in column (A41) and the small plug-in column (A42); a second engaging step (B22) is provided in the plug hole (B21); the step structure matches the second engaging step (B22) structure.

7. The square battery for easy integration according to claim 1, characterized in that: Four strip-shaped limiting grooves (A11) are evenly arranged on the enclosure (A1), and four extrusion pieces (B3) are arranged corresponding to the four limiting grooves (A11).

8. The square battery for easy integration according to claim 1, characterized in that: The bottom plate (A3) is a circular structure, the first engaging step (A2) is a circular ring structure, and the plug connector body is a cylindrical structure.

9. A battery module, characterized in that: It comprises a plurality of square batteries that are easy to integrate as described in any one of claims 1 to 8, wherein adjacent square batteries are connected by plugging the positive electrode cover plate and the negative electrode cover plate.

10. The battery module according to claim 9, characterized in that: The adjacent square batteries are electrically connected via conductive connectors and are liquid-conducting via liquid-conducting connectors; The conductive connector comprises a socket (A), a plug connector (B) and a conductive connection plate (F), wherein the socket (A) and the plug connector (B) are respectively arranged at two ends of the conductive connection plate (F); The liquid-conducting connecting member comprises a mounting seat (C), a liquid-passing structure body (D) and a liquid-conducting connecting seat (E); the liquid-conducting connecting seat (E) comprises a liquid-conducting tube (E3) and a first liquid-collecting member (E1) and a second liquid-collecting member (E2) arranged at both ends of the liquid-conducting tube (E3); the first liquid-collecting member (E1) is connected to the mounting seat (C), and the second liquid-collecting member (E2) is connected to the liquid-passing structure body (D).

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