A structure of an energy storage battery pack

Abstract

The present invention relates to the technical field of batteries, and specifically discloses a structure of an energy storage battery pack, which includes a battery pack body, a positive connection component, and a negative connector socket. The battery pack body includes a box body, a battery cell module disposed inside the box body, and a module end plate disposed at the end of the battery cell module. A battery cell positive bus connection piece is provided on the module end plate, and the positive electrode of the battery cell module is electrically connected to the battery cell positive bus connection piece. A wire passing hole is provided on the side wall of the box body; the positive connection component includes a power cable, one end of the power cable is provided with a negative power connector, and the other end extends into the interior of the box body through the wire passing hole and is electrically connected to the battery cell positive bus connection piece; the negative connector socket is adapted to the negative power connector, and the negative connector socket is electrically connected to the negative electrode of the battery cell module. The present invention can reduce the number of components for power connection between battery packs, reduce the number of high-voltage connectors used, and has the advantages of simplifying the product installation operation, improving the reliability of power connection, and reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a structure of an energy storage battery pack. Background Art

[0002] At present, in order to provide sufficient voltage, power, and energy for energy storage battery pack series products, multiple battery cells with the same capacity and voltage platform need to be connected in series or parallel to form a module. The battery cell module is connected to a connector base through a busbar, and then the battery pack and other high-voltage circuit components are completely connected through a connector wire end plug and an EV copper wire cable. Only when the power connection is complete and reliable can the entire energy storage system operate normally for charging and discharging, and the power connection between the packages needs to be designed considering multiple dimensions. However, in the prior art, two sets of connectors are required for the positive and negative electrodes of each battery pack, which is costly and also reduces the sealing reliability of the battery pack. If the connector seal fails, the protection level of the battery pack will decrease, and there is a risk of water ingress and leakage in the battery pack; in addition, using connectors for both the positive and negative electrodes increases the number of series components in the high-voltage circuit, increases the contact resistance, and the greater the heat generation, the higher the failure risk. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: how to reduce the number of components for the power connection between the packages, reduce the number of high-voltage connectors used, improve the reliability of the power connection, and reduce costs.

[0004] To solve the above technical problem, the present invention provides a structure of an energy storage battery pack, including:

[0005] A battery pack body, the battery pack body includes a box body, a battery cell module disposed in the box body, and a module end plate disposed at the end of the battery cell module. A battery cell positive electrode busbar connection piece is provided on the module end plate, and the positive electrode of the battery cell module is electrically connected to the battery cell positive electrode busbar connection piece. A wire passing hole is provided on the side wall of the box body;

[0006] A positive electrode connection assembly, the positive electrode connection assembly includes a power cable. One end of the power cable is provided with a negative power connector, and the other end extends into the interior of the box body through the wire passing hole and is electrically connected to the battery cell positive electrode busbar connection piece; and

[0007] A negative connector socket, the negative connector socket is adapted to the negative power connector, and the negative connector socket is electrically connected to the negative electrode of the battery cell module.

[0008] Further preferably, an insulating fixing bracket is provided on the module end plate, and the battery cell positive electrode busbar connection piece is fixed on the insulating fixing bracket.

[0009] Further preferably, a copper bar is provided at one end of the power cable extending into the interior of the box body, and the copper bar is connected to the positive electrode bus bar of the battery cell through a fixing bolt.

[0010] Further preferably, the maximum width of the copper bar is smaller than the diameter of the wire passing hole.

[0011] Further preferably, the positive electrode connection assembly further includes a sealing unit, the sealing unit is sleeved on the power cable, and the sealing unit is installed corresponding to the wire passing hole.

[0012] Further preferably, the sealing unit includes:

[0013] A waterproof plug, the waterproof plug is sleeved on the power cable and placed outside the box body;

[0014] A fixing nut, the fixing nut is arranged inside the box body and is used for threaded connection with one end of the waterproof plug; and

[0015] A locking press head, the locking press head is arranged outside the box body and is used for threaded connection with the other end of the waterproof plug.

[0016] Further preferably, the waterproof plug includes a main body part sleeved on the power cable and a first threaded part and a second threaded part respectively arranged at both ends of the main body part. The first threaded part extends into the inner side of the box body through the wire passing hole and is threadedly connected with the fixing nut, and the locking press head is threadedly connected with the second threaded part.

[0017] Further preferably, the maximum width of the main body part is greater than the diameter of the wire passing hole, and the diameters of the first threaded part and the second threaded part are smaller than the diameter of the wire passing hole.

[0018] Further preferably, the sealing unit further includes a sealing ring, the sealing ring is sleeved on the power cable, and the sealing ring is placed between the outer wall of the box body and the main body part.

[0019] Further preferably, the sealing unit further includes:

[0020] A wire harness sealing silicone tube, the wire harness sealing silicone tube is sleeved on the power cable, and one end of the wire harness sealing silicone tube extends into the inner side of the second threaded part, and the other end of the wire harness sealing silicone tube is placed outside the second threaded part and forms an annular gap; and

[0021] A wire harness sealing silicone ring, the wire harness sealing silicone ring is sleeved on the power cable and placed in the annular gap. After the locking press head is threadedly connected with the second threaded part, the wire harness sealing silicone ring is in interference connection with the wire harness sealing silicone tube.

[0022] Compared with the prior art, the energy storage battery pack structure provided by the present invention has the following beneficial effects:

[0023] In the present invention, a positive connection component and a negative connector socket are integrated on the battery pack body, and one end of the power cable is provided with a negative power connector, which can be adapted to the negative connector socket. When multiple energy storage battery pack structures are connected in series, the negative power connector of one energy storage battery pack structure can be directly connected to the negative connector socket of another energy storage battery pack structure to achieve the series connection of the two energy storage battery pack structures. There is no need to arrange connectors at both the positive and negative poles simultaneously. The present invention can reduce the number of components for power connection between the packages, reduce the number of high-voltage connectors used, and directly connect the negative power connector to the negative connector socket, which has the advantages of simplifying the product installation operation, improving the reliability of power connection, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the energy storage battery pack structure described in the present invention.

[0025] Figure 2 is an internal schematic diagram of the energy storage battery pack structure described in the present invention.

[0026] Figure 3 is an assembly drawing of the positive connection component, the positive electrode bus bar connection piece of the battery cell, and the module end plate described in the present invention.

[0027] Figure 4 is an assembly schematic diagram of the positive connection component and the box body described in the present invention.

[0028] Figure 5 is a connection diagram of the positive connection component and the positive electrode bus bar connection piece of the battery cell described in the present invention.

[0029] Figure 6 is a schematic structural diagram of the sealing unit described in the present invention.

[0030] Figure 7 is an exploded view of the sealing unit described in the present invention.

[0031] Figure 8 is a cross-sectional view of the sealing unit and the box body after assembly described in the present invention.

[0032] Figure 9 is a schematic diagram of multiple energy storage battery pack structures described in the present invention after being connected in series.

[0033] In the figure:

[0034] 100. Energy storage battery pack structure;

[0035] 110. Battery pack body; 111. Box body; 1111. Wire passing hole; 112. Battery cell module; 113. Module end plate; 1131. Insulating fixing bracket; 1132. Battery cell positive bus connection piece; 1133. Fixing bolt;

[0036] 120. Positive connection component; 121. Power cable; 122. Negative power connector; 123. Copper busbar; 124. Sealing unit; 1241. Waterproof plug; 1241a. Main body part; 1241b. First threaded part; 1241c. Second threaded part; 1242. Fixing nut; 1243. Sealing ring; 1244. Locking press head; 1245. Wire harness sealing silicone tube; 1246. Wire harness sealing silicone ring;

[0037] 130. Negative connector socket. Detailed implementation manners

[0038] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top", "bottom", "between", "close to", "far from", "one side / end", "the other side / end", "parallel", "perpendicular", "end", "side wall", "opposite", "horizontal", "edge", etc. in the present invention is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0040] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0044] As Figure 1 shown, this embodiment provides an energy storage battery pack structure 100, which includes a battery pack body 110, a positive connection assembly 120 and a negative connector socket 130 integrated on the battery pack body 110. The energy storage battery pack structure 100 does not require connectors to be arranged on both the positive and negative electrodes at the same time, reducing the number of components for power connection between the packages and lowering the cost.

[0045] In a specific embodiment, as Figures 2 - 5 shown, the battery pack body 110 includes a box body 111, a battery cell module 112 disposed in the box body 111, and a module end plate 113 disposed at the end of the battery cell module 112. A battery cell positive electrode busbar connection piece 1132 is provided on the module end plate 113, and the positive electrode of the battery cell module 112 is electrically connected to the battery cell positive electrode busbar connection piece 1132. A wire passing hole 1111 is provided on the side wall of the box body 111.

[0046] In a specific embodiment, as Figures 2 - 5As shown, the positive electrode connection assembly 120 includes a power cable 121. One end of the power cable 121 is provided with a negative power connector 122, and the other end extends into the interior of the box body 111 through a wire passing hole 1111 and is electrically connected to the positive electrode bus connection piece 1132 of the battery cell; the negative connector socket 130 is adapted to the negative power connector 122, and the negative connector socket 130 is electrically connected to the negative electrode of the battery cell module 112; thus, by integrating the positive electrode connection assembly 120 and the negative connector socket 130 on the battery pack body 110, and one end of the power cable 121 is provided with a negative power connector 122, which can be adapted to the negative connector socket 130. When multiple energy storage battery pack structures 100 are connected in series, the negative power connector 122 of one energy storage battery pack structure 100 can be directly connected to the negative connector socket 130 of another energy storage battery pack structure 100, and multiple energy storage battery pack structures 100 can be connected in series in the high-voltage circuit by superimposing them in turn, as Figure 9 shown. It is not necessary to arrange connectors at both the positive and negative electrodes simultaneously. The present invention can reduce the number of components for power connection between packages, reduce the number of high-voltage connectors used, and directly connect the negative power connector 122 to the negative connector socket 130, having the advantages of simplifying the product installation operation, improving the reliability of power connection, and reducing costs.

[0047] In some embodiments, please continue to refer to Figure 3 and Figure 5 . To ensure the stable connection between the power cable 121 and the positive electrode bus connection piece 1132 of the battery cell, a copper bar 123 is provided at one end of the power cable 121 extending into the interior of the box body 111. Among them, the copper bar 123 is electrically connected to the positive electrode bus connection piece 1132 of the battery cell.

[0048] In other embodiments, to ensure the disassembly, installation, and replacement of the power cable 121, the copper bar 123 and the positive electrode bus connection piece 1132 of the battery cell are connected by fixing bolts 1133, which is simple to disassemble and install, and has strong flexibility and operability.

[0049] In some embodiments, please refer to Figure 3 and Figure 5 . The module end plate 113 is provided to fix the battery cell module 112 in the box body 111 on one hand. On the other hand, an insulating fixing bracket 1132 is provided on the module end plate 113, and the positive electrode bus connection piece 1132 of the battery cell is fixed on the insulating fixing bracket 1132. By providing the insulating fixing bracket 1132, the stable connection between the positive electrode bus connection piece 1132 of the battery cell and the copper bar can be ensured, and problems such as short circuits caused by line interference can be avoided.

[0050] In other embodiments, the maximum width of the copper busbar 123 is less than the diameter of the wire passing hole 1111, so as to ensure that one end of the copper busbar 123 can easily pass through the wire passing hole 1111 and extend into the interior of the box body 111, improving the installation efficiency and simplifying the product installation operation.

[0051] In some embodiments, please refer to Figure 4 and Figure 5 for understanding. Since the wire passing hole 1111 is provided, the box body 111 is in a non-sealed state. Therefore, after the power cable 121 passes through the wire passing hole 1111, the position of the wire passing hole 1111 still needs to be sealed. For this purpose, the positive connection assembly 120 further includes a sealing unit 124. The sealing unit 124 is sleeved on the power cable 121, and the sealing unit 124 is installed corresponding to the wire passing hole 1111. Arranging the sealing unit 124 on the power cable 121 can not only maintain the sealing performance of the battery pack, but also reduce the number of components for power connection between the packages.

[0052] In the above embodiments, the power cable 121 includes a cable core and an insulating skin for wrapping the cable core. On the one hand, the sealing unit 124 seals the wire passing hole 1111 on the side wall of the box body 111, and on the other hand, it seals with the insulating skin for wrapping the cable core. On the premise of ensuring the current-carrying performance and insulating performance of the power cable 121, the double sealing can improve the sealing reliability of the battery pack, enabling the battery pack to achieve the effects of waterproof and dustproof, effectively avoiding the problems of the reduction of the protection level of the battery pack caused by the sealing failure of the connector and the risk of electric leakage due to water ingress into the battery pack.

[0053] In the above embodiments, the copper busbar 123 is connected to the cable core, which can be a crimp connection or a welding connection.

[0054] In some embodiments, as Figures 6 - 8 shown, the sealing unit 124 includes a waterproof plug 1241, a fixing nut 1242, and a locking head 1244. Among them, the waterproof plug 1241 is sleeved on the power cable 121 and is located outside the box body 111; the fixing nut 1242 is arranged inside the box body 111 and is used for threaded connection with one end of the waterproof plug 1241; the locking head 1244 is arranged outside the box body 111 and is used for threaded connection with the other end of the waterproof plug 1241; by means of the fixing nut 1242 and the locking head 1244, the waterproof plug 1241 can be sealed and fixed on the wire passing hole 1111, thus achieving the sealing effect on the wire passing hole 1111.

[0055] In the above embodiment, the waterproof plug 1241 includes a main body portion 1241a sleeved on the power cable 121, and a first threaded portion 1241b and a second threaded portion 1241c respectively provided at both ends of the main body portion 1241a. The first threaded portion 1241b extends into the inner side of the box body 111 through the wire passing hole 1111 and is threadedly connected to the fixing nut 1242. When the fixing nut 1242 is tightened with the first threaded portion 1241b, the main body portion 1241a fits against the outer wall of the box body 111, thereby sealing the wire passing hole 1111, ensuring the protection level of the battery pack and avoiding the risk of water ingress and leakage in the battery pack.

[0056] In some embodiments, to further improve the sealing performance between the waterproof plug 1241 and the wire passing hole 1111, for this purpose, a sealing ring 1243 is further provided between the outer wall of the box body 111 and the main body portion 1241a. The sealing ring 1243 is sleeved on the power cable 121. When the fixing nut 1242 is tightened with the first threaded portion 1241b, the elastic deformation of the sealing ring 1243 is utilized to improve the sealing effect of the wire passing hole 1111.

[0057] In the above embodiment, to ensure that the main body portion 1241a can seal the wire passing hole 1111 after fitting with the sealing ring 1243, for this purpose, it is defined that the maximum width of the main body portion 1241a is greater than the diameter of the wire passing hole 1111, and the diameters of the first threaded portion 1241b and the second threaded portion 1241c are smaller than the diameter of the wire passing hole 1111. In this way, the first threaded portion 1241b can extend into the interior of the box body 111 through the wire passing hole 1111, and the main body portion 1241a can fit against the outer wall of the box body 111 through the sealing ring 1243. The sealing ring 1243 is compressed and deformed, and the contact area between the main body portion 1241a and the sealing ring 1243 increases, thereby improving the sealing effect.

[0058] In some embodiments, the locking head 1244 is threadedly connected to the second threaded portion 1241c. The function of the locking head 1244 is to achieve the seal between the waterproof plug 1241 and the power cable 121, ensuring that the seal between the waterproof plug 1241 and the power cable 121 can achieve the effects of waterproof and dustproof.

[0059] In some embodiments, the sealing unit 124 further includes a wire harness sealing silica gel tube 1245. The wire harness sealing silica gel tube 1245 is sleeved on the power cable 121, and one end of the wire harness sealing silica gel tube 1245 extends into the inner side of the second threaded portion 1241c. In this way, during the process of tightening the locking head 1244 with the second threaded portion 1241c, the wire harness sealing silica gel tube 1245 is compressed and deformed, thereby tightly holding the insulating skin for wrapping the cable core, so that a sealing effect is formed between the waterproof plug 1241 and the power cable 121. Combining with the sealing ring 1243 can achieve a double sealing effect, effectively ensuring the sealing performance of the battery pack.

[0060] In other embodiments, to further improve the sealing effect between the waterproof plug 1241 and the power cable 121, the other end of the wire harness sealing silicone tube 1245 is placed outside the second threaded portion 1241c to form an annular notch. The sealing unit 124 further includes a wire harness sealing silicone ring 1246. The wire harness sealing silicone ring 1246 is sleeved on the power cable 121 and placed in the annular notch. After the locking head 1244 is threadedly connected to the second threaded portion 1241c, the wire harness sealing silicone ring 1246 is in interference connection with the wire harness sealing silicone tube 1245. In this way, during the process of screwing the locking head 1244 onto the second threaded portion 1241c, the inner wall of the locking head 1244 presses the annular notch of the wire harness sealing silicone tube 1245, so that the wire harness sealing silicone ring 1246 is in interference connection with the wire harness sealing silicone tube 1245, thereby ensuring that the wire harness sealing silicone ring 1246 tightly holds the outer wall of the power cable 121 to achieve the sealing effect.

[0061] In some embodiments, the waterproof plug 1241, the fixing nut 1242, and the locking head 1244 are installed and connected by threads, which can not only effectively achieve the sealing effect but also facilitate disassembly and assembly. On the premise of maintaining the sealing performance of the battery pack, the number of components for power connection between the packages can be reduced, the number of high-voltage connectors used can be reduced, and it has the advantages of simplifying the product installation operation, improving the reliability of power connection, and reducing costs.

[0062] In summary, the embodiment of the present invention provides an energy storage battery pack structure. By integrating the positive connection component 120 and the negative connector socket 130 on the battery pack body 110, and one end of the power cable 121 is provided with a negative power connector 122, which can be adapted to the negative connector socket 130. When multiple energy storage battery pack structures 100 are connected in series, the negative power connector 122 of one energy storage battery pack structure 100 can be directly connected to the negative connector socket 130 of another energy storage battery pack structure 100 to achieve the series connection of the two energy storage battery pack structures 100. There is no need to arrange connectors at both the positive and negative poles simultaneously. The present invention can reduce the number of components for power connection between the packages, reduce the number of high-voltage connectors used, and directly connect the negative power connector 122 to the negative connector socket 130, which has the advantages of simplifying the product installation operation, improving the reliability of power connection, and reducing costs.

[0063] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention. The basic principles, main features and advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention.

[0064] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy storage battery pack structure, characterized in that: include: A battery pack body, the battery pack body comprising a box body, a battery cell module arranged in the box body, and a module end plate arranged at the end of the battery cell module, the module end plate is provided with a battery cell positive electrode bus connection piece, the positive electrode of the battery cell module is electrically connected to the battery cell positive electrode bus connection piece, and a wire hole is provided on the side wall of the box body; A positive connection assembly, the positive connection assembly comprising a power cable, one end of the power cable is provided with a negative power connector, the other end of the power cable extends into the interior of the box through the wire hole and is electrically connected to the positive busbar of the battery cell, the positive connection assembly also comprises a sealing unit, the sealing unit is sleeved on the power cable, and the sealing unit is installed corresponding to the wire hole; and A negative connector socket, the negative connector socket is adapted to the negative power connector, and the negative connector socket is electrically connected to the negative electrode of the battery cell module; A copper bar is provided at one end of the power cable extending into the box, and the copper bar is connected to the positive busbar of the battery cell by a fixing bolt; The maximum width of the copper busbar is smaller than the diameter of the wire-passing hole.

2. The energy storage battery pack structure according to claim 1, characterized in that: An insulating fixing bracket is arranged on the module end plate, and the positive busbar connecting piece of the battery cell is fixed on the insulating fixing bracket.

3. The energy storage battery pack structure according to claim 1, characterized in that: The sealing unit comprises: A waterproof plug, which is sleeved on the power cable and placed outside the box; A fixing nut, the fixing nut being arranged inside the box body and being used for being threadedly connected with one end of the waterproof plug; and A locking pressure head is arranged on the outside of the box body and is used for threaded connection with the other end of the waterproof plug.

4. The energy storage battery pack structure according to claim 3, characterized in that: The waterproof plug includes a main body portion sleeved on the power cable and a first threaded portion and a second threaded portion respectively arranged at both ends of the main body portion, the first threaded portion extends into the inner side of the box body through the wire hole and is threadedly connected to the fixing nut, and the locking pressure head is threadedly connected to the second threaded portion.

5. The energy storage battery pack structure according to claim 4, characterized in that: The maximum width of the main body is greater than the diameter of the wire passing hole, and the diameters of the first threaded portion and the second threaded portion are smaller than the diameter of the wire passing hole.

6. The energy storage battery pack structure according to claim 4, characterized in that: The sealing unit further comprises a sealing ring, which is sleeved on the power cable and is placed between the outer wall of the box and the main body.

7. The energy storage battery pack structure according to claim 4, characterized in that: The sealing unit further comprises: A wire harness sealing silicone tube, wherein the wire harness sealing silicone tube is sleeved on the power cable, and one end of the wire harness sealing silicone tube extends into the inner side of the second threaded portion, and the other end of the wire harness sealing silicone tube is placed on the outer side of the second threaded portion to form an annular notch; and A wire harness sealing silicone ring is sleeved on the power cable and placed in the annular notch. When the locking pressure head is threadedly connected to the second threaded portion, the wire harness sealing silicone ring is interference-connected with the wire harness sealing silicone tube.

Images